Hello everyone! I have been running a series of campaigns that have all taken place in a world of my creation. I was wondering if I could get some community input on things I can add to my world to enhance my players experience. I will give out the basic information of each of the seven major land masses here, if you would like more information on anything you can message me on DnDbeyond or Dcord (Vargrath#8764). At the moment I only have three  of the seven contents flushed out. Side note the only racily pure kingdom/faction is the Eternal Kings empire, they are all human.

1.) Vera Loth.  Being the largest of the landmasses a majority of the worlds events take place here. The land itself has a variety of climates, from desserts in the south, to icy mountains in the north.  To the north the kingdom of the Dwarf lords resides. Their impressive technology (almost steampunk level) has kept their enemies at bay for a millennium. To the south the Serator Empire has dug in. An invader to this land, their people are often prosecuted outside their borders. Make no mistake their military presence is no Laughing matter. To the east a strange tribe of orcs have made their home. Their bloodline has been cursed in a way that would frighten most orcs. The orc lust for blood has been stripped away from them, causing them to focus on scholarly ideals instead. The west is home to a Hybrid kingdom of elves and mankind. The only reason they have survived for the two thousand years that they have is their unyielding tenacity. They learn from their mistakes and constantly appropriate their foes tactics and equipment. In the middle of all these great nations stands the last bastion of the Eternal king and his people. The oldest faction on this island, the Eternal king has seen rivals rise to power and more so fall to nothingness. Rumors have it  that his great halls on this continent is nothing but a summer home for him and his people.

2.) Alvasta The smallest landmass in this world, Alvasta hides deep in the frozen waters in the southern regions. This island is home only to one people. The Eternal king's true capital sits atop the great mountain. A strange magic shields the land from the harsh weather making it a temperate oasis in the frozen sea. The Empire has a small archipelago off its southern border that act as their main source of food production and its the only way out of the ice fields. 

3.) Magmal. A modestly sized landmass sits in the warm waters north of the ice fields, and just south of Vera Loth. Three fourths of the land is dessert. with the last quarter being a dry but pleasant savanna. The Serator Empire holds most of the land in the savanna and they have three great cities in the vast desserts. Along with the Snake people from Serator, a large amount of tribal people occupies the desserts. tribes of various affiliation and races spot the sandy dunes. The remainder of the Savanna belongs to the beasts of the wild. No great nation will even attempt to colonies the deeper parts of the almost jungle like zone.

Those are the three that I have flushed out, again if you want any extra information on them feel free to message me. I also have some smaller islands and cities within the areas that Have a lot of lore and fillings as well. I would appreciate any and all input in my work. thanks

Do you have any ideas at all yet for the other four continents you are planning to have?

What aspects of the continents that you have already planned out would you like suggestions on?  How the common folk might act, how their power structures could work, or even how they might deal with other groups?

You have a good framework, just not sure what you are looking for input on to fill them out.

Mostly I was looking for Ideas on the other four, I know I want one to be occupied by Giants, each race divided up into their respective habitats. The worlds major dragon population lives spread out on a series of archipelagos in the western seas. 

If you really feel like helping me I kinda want to do a community protect where people create a city/town/village/island/fortress to be added. You could pick what kingdom/faction it would be apart of if any. I also forgot to mention that there is an other faction on the main island and the surrounding islands called the Free Cities. It's just a collection of neutral/ unaffiliated peoples.  

Well with the mention of giants I would advocate a series of larger islands in a sort of archipelago.
  One section incredibly active volcanically where the Fire Giants have made homes in and around the volcanoes.
  Perhaps earlier in the chain there are the extinct volcanoes reaching to the sky where the Cloud Giants could have enclaves enclosed in constant cloud cover.  They are at odds with the Fire Giants (shocker : ) because they pushed them out of their ancestral homes perhaps millennia ago after the mountains ceased to be volcanic.
  Stone Giants could be living on some of the same islands as the Cloud Giants, perhaps having enclaves scattered across the archipelago.
  Hill Giants would be on the oldest of the volcanic chain that have been worn down by erosion and time because they are given the 'scraps' of the table.
  That leaves Storm Giants, and Frost Giants.  I picture the archipelago being near the north but with their high levels of of vulcanism they would remain somewhat warm and temperate with a handful of the northerly most islands being frigid and homes to the Frost Giants where sea currents bring colder air and water from the north.
  Storm Giants I am not sure of, with all the vulcanism in the region perhaps couple with some of the higher mountains strange wind and sea currents cause massive flash storms on par with hurricane or typhoon levels winds.  Even water spouts from the odd ways the atmosphere moves around these islands.  Although they could be on the stormiest of islands perhaps it would be a good fit to have them in an undersea kingdom, avoiding direct interaction or conflict with the other giants in the regions.  If you are familiar with Charybdis or the Maelstrom the strange tides between the islands might create a whirlpool that occasionally gives access to their domain?

Footprints of the Giants, The Giants Step, The Giants Tread, Giants Approach.  Something like that I would picture the islands generally being in a line something like the Aleutian islands or Hawaii.