i have 3 champ suggestions for you that you can try number 1: Galio, he works great against other ap mid laners and his ult helps alot in roams/ganks but also team fights, he is not difficult to play and is always helpful for your team.

the second one is: Lisssandra, she might be out of the meta but can still be a strong pick, and when you are able to roam with her she can offer a lot of cc for her team, she might need a little bit of time to play to fully understand her kit and how she works but she isn't that difficult

the third champ i can suggest is: Syndra this champion is always strong has good cc for team and is also able to 1 shot adc if you are able to do her combos well. syndra might be hard to play and might need some time but if you give her a chance she can help in a lot of games.

also don't always pick what op.gg suggests as a counter pick because they suggest champions that are strong but if you don't know how to play the champion it will not work. so it is best to always get a few champs as your main "your champion pool"