Quote Originally Posted by Xetheral View Post
Party members with advantage-granting spells can also be a good source of advantage. The best low-level one is Faerie Fire. If your party's primary spellcasters are spending their concentration on other things, a 1-level dip into Bard, Druid, (Light) Cleric, or (Archfey) Warlock lets you cast Faerie Fire multiple times per day, and gives you a use for your otherwise-unoccupied concentration slot.

There is also an old Valor Bard sharpshooter build to be aware of. It doesn't come online until 10th level when the Bard can take Swift Quiver as a Spell Secret, but it lets you put out just as many shots as an 11th level Crossbow Expert fighter, doesn't lock you into a hand crossbow, and you can freely alternate between four shots per round or two shots plus a spell. Alas, Swift Quiver requires concentration, so it precludes Faerie Fire, or Greater Invisibility, so you'll need a different source of advantage. An upcast Blindness/Deafness works well, although in exchange for being concentration-free it is far less slot-efficient. Also note that the Bard can upcast Bestow Curse to make it concentration-free too, which can be a powerful debuff in boss fights (although again is horribly slot-inefficient).
IMO, Too much opportunity costs for most of those abilities.

Faerie Fire - takes an action you could be firing 4 SS arrows. Can fail.

Swift Quiver - In a 4 round fight you are making 14 shots vs 16 (19 with action surge). You have less accuracy. You rely on concentration. You can't fire into melee (no crossbow expertise).