@Riot can you demote me to my proper MMR?

Hi, Riot.

I'm a Diamond player, but my MMR is low. How do I know I'm a diamond caliber player? I've been here since season 3 or something, and I peaked master tier blah blah this is my sob story etc. The point of this is, my MMR is lower than it should be due to negative W-L ratio, and it's annoying to win one game, get 14, lose one, get 23. I would much rather be placed at like, Plat 4, and simply get back to Diamond (again, btw, I fell out of diamond 2 times in season 7 and got back in P5 -> D5).

Essentially, I'm asking that you place me properly where my lower MMR is in terms of the LP rank system. I'll get back to diamond and fix my MMR that way, instead of feeling irritable as I see little gains since the demotion prevention system is cucking my MMR, and not letting me fall. Thank you.