Okay, here's my humble yearly Artfight advice, because with every AF, there's always a bit of an ongoing cycle:
While you can't ever guarantee revenges, your chances of getting art back are always higher if you target people with positive ratios. There's a lot of people on site who have +75% attack ratios (meaning they've drawn way more art than they have received). Go target them! They deserve love AND are way more likely to return art!
DO NOT fall for random celeb tiktokker with 50k followers who is, for the seventh year in a row, promising they will be revenging all the art they get all while their ratio sits at a whooping 5%! There's always some people like this and a lot of younger folk fall for it again and again. And then these people don't even bother with commenting on the art they receive
In my experience, it's younger folk or people who are newer to art that will go more apeshit (affectionate) about the art they receive. If you really wanna make someone's entire week, find yourself someone who is new to AF or someone who has just started drawing and give them a lil something, they will adore it!
Artfight can be a great opportunity to make friends. I've met some wonderful people through exchanging art there. Use the search function to find characters tagged as things you have an interest in and go ham. Chances are, you may meet someone with similar interests who may end up becoming a long term friend.
While receiving revenges is great, don't try to guilt trip people for them. Don't go around posting comments on people's profiles like "If I draw for you will you revenge me??" Just draw for the person if you'd like to draw for them, don't do it expecting the whole situation to be a transaction
A lot of people will mention in their profiles whether they are revenging or not. It's a good idea to check that out if you are interested in revenges- But never take these as a 100% guarantee
Comment on art you have received! It doesn't need to be a deep comment. Sometimes gushing over it and dropping 30 emojis and a big thank you gets the point across. It can be rather daunting to not receive any confirmation that the person you drew for even saw the art you made for them.
And honestly, just be honest with yourself and how much art you can make without burning out or hurting yourself. Make your stretches, rest your hand, and try to have fun without sacrificing your health on the way!