Champion pool help.

Hey guys I just want some help on adjusting my champion pool. To start im low elo and wanting ro climb. I main mid and top with support as a third if i want or autofill. For top lane i play Pantheon main, maokai, Gp Mid velkoz main, taliyah, gp , pantheon(niche pick) Support Velkoz main Taliyah

the 2 im wondering about mainly are taliyah and gp. they are harder. Gp is godly late game, but barrwls can be hard. Taliyah is really fun, but feels kinda weak and the wall can mess things up. any suggestions on how to improve my group?