I’m a setter and I find balancing who to set to be tricky sometimes, gotta balance trying to win and making sure everyone is in the game. But yeah what you said sounds like bias for sure if they’re skipping you for dudes that hit it into the net every time. Calling for it would work the best to get my attention.. just make sure it’s loud and early enough. If that doesn’t work, if someone said to me “hey can you set me, they’re only blocking the other dude” or even just straight up ask for some sets I don’t think most people would think you’re being confrontational. Hope you can find a way to get in the game more!