What is the maximum amount of damage per turn for a 7th level player character? [closed]

I’m making an appearance in a friend’s game as a visiting mercenary and I’d like for my character to make an impression. I was thinking about putting 5 levels into Battle Master Fighter to be able to get the sharpshooter feat, and then putting 2 levels into war cleric to get the +10 to offset sharpshooter, but I’m wondering if there are even greater heights of possible maximization that I’m missing.