Professional

when you take this subclass at 3rd level you gain access to these features  

Professional - 

Sweet Spot - normally when you have advantage from multiple sources you still just roll one extra d20 this subclass tries to give you a reason to stack advantages by making each advantage after 1 will decrease the number needed to score a critical hit, so advantage from 2 sources allows you to score a critical hit on a 19 or 20 and a third source would make 18 a critical as well. 

Altered Ammunition - 

 Starting at 9th level

Prep Time

once per turn, when you make an attack roll that has multiple sources of advantage you can score a critical hit on one other number of your choice for every source of advantage after the first (2 sources of advantage lets you choose 1 other number, 3 sources lets you choose 2 numbers to be the same as rolling a natural 20).  When you roll a critical on both die you gain a stack of the In Your Element condition.
every stack of the In Your Element condition gives you advantage on your next attack, you lose one stack of In your element at the end of your turn , you gain a stack if you crit on an attack while you have the In Your Element Condition

Sweet Spot

at the end of a long rest you may choose 2 distances 5 feet apart, when making attack rolls against a target withing this range you have advantage. Both of these distances must be greater than 10 feet.

Sweeter Spot

Starting at 9th level, you may choose a 10 foot wide range for Sweet Spot and it may be any range you want.

Master of Some

At 13th level, your versatility reaches new heights, you gain the ability to become proficient in a number of things equal to your intelligence modifier until the next long rest. If you are already proficient or an expert in these things you may add half of your proficiency bonus rounded up. 

Saving Throw Proficiency

Choose a saving throw to gain proficiency in

Skill Proficiency

Choose a skill to become proficient in or add half your proficiency bonus to if you already have proficiency or expertise in that skill

Tool Proficiency

choose a tool to become proficient in

Weapon Proficiency

Choose a weapon to gain proficiency in

Inspiring Professionalism

Starting at 17th level, you become a paragon of professionalism, you gain the ability to spread your critical hits to your party members as well. when you deal a critical hit on an enemy, an ally within 5 feet of either you or the target may use a reaction make an attack roll with a weapon or single target spell, if it is a successful attack roll that attack becomes a crit, if it was a critical hit anyway you and the ally gain a stack of In Your Element.