I'm homebrewing a sorcerer subclass for a campaign I'm running. It's a nature-themed subclass, which I want to focus mainly on support. This is what I got so far -

Your magic comes from nature itself. The living power of plants and beasts around you follows through your veins.

 Level 3: Primal Spells
When you reach a Sorcerer level specified in the Primal Spells table, you thereafter always have the listed spells prepared.
Primal Spells
Sorcerer Level     Spells
3     Animal Friendship, Barkskin, Entangle, Summon Beast
5     

Plant Growth, Conjure Animals
7     Dominate Beast, Grasping Vine
9     Awaken, Commune with Nature

 Level 3: Attuned to Nature

Your connection to the natural world enhance your ability to interact with it. you gain a bonus to your Intelligence (Nature) and Wisdom (Animal Handling or Survival) checks. The bonus equals your Charisma modifier (minimum of +1).

In addition, you always have Speak with Animals prepared, and it dose not count against the number of spells you know. You can cast it without expending a spell slot. Once you have, you cannot do so again until you finish a long rest, unless you spend 1 Sorcery Point.

I'm having some hard time coming up with higher level features that maintain a sorcerer feeling, and not just rip off druid stuff. Any suggestions?

Maybe give them a similar feature to the dragon sorcerer's Max level feature, but at lower level, and with summon beast instead.

I feel like sorcerers are ripping of druids as a base class and are better druids in some ways than druids are themselves. This subclass would just be the (nonexistant) druid spellcasting subclass, but as a sorcerer. 2¢