Trying new champs

I was wondering if it's worth it trying new champs. Because if I try something new it will always fu** up my winrate. I wanted to learn champ but then I had to switch to another one because of my teammates. Example: I like to play Taliyah nowadays but I just can't learn how to win other lanes. Before Taliyah I was Talon main and if there was losing lane I always won the lane for them. But for me with Taliyah this is not that easy. And I end up losing my own lane because I was helping others. I'm in Iron somehow, I was Silver in season 9. And placements gave me and my friends Iron like wtf. Even in draft pick i can get better teammates. My question is then: Should I try other champs too (adjust for team) or stick to played ones?
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