I am done trying, how can I lose games and not get banned?

I am unranked player playing with or vs. plat/diamond players and I am tired of it. I have negative win ratio.

I also don't have fun at all when I can't do almost anything in game where they are all so much more skilled then me.

And because of that I wanna lose all my games to start playing vs. unranked players like me. How do I do that and not get banned? I wanna have fun again, now they just stomp me...and no, I don't want to improve, I just wanna play vs. players who are my skill level.

I can't play ranked cuz I don't have enough champions. So I can only play normal games.

Thanks for advices!