If I message Riot support can they change my rank?

So i grinded and tried super hard to get Diamond this season, I got it I'm sitting around Diamond3/Diamond 2 now (constantly ranking up to d2 then demoting to d3 again repeatedly). I basically just play support and specifically only play Soraka as she is my best support champion by far, this is because that's basically the only role I can play at this diamond level. I usually play a lot of mid/adc but if I play mid lane (I main mid lane Lux) in this elo I get smashed. So I basically can onyl stick to support and onyl Soraka. And last night I got chat restricted for calling the 3 teammates who were flaming me "idiots". They kept saying how they were going to report me because I was "trolling", their reasoning being I had electrocute on Soraka (which I said at the beginning of the game was an accident) when they kept on blaming me I did call them idiots for thinking I was trolling. So anyway apparently that's enough for me to get chat restricted and now I'm honor level 1. I tried to appeal to Riot because I've never not got my end of season rewards I'm actually pretty positive player and I literally just called them idiots that's it. But no they said I was toxic and it doesn't matter.

So now that I don't get my end of season rewards, I don't awnt to be diamond anymore. It's awful, I can't play mid or adc anymore because I'm not good enough, and my game quality is so bad compared to when I was in mid platinum. Mid platinum I hardly ever got ragequitters or people giving up because they died once or twice. Now I get those type of players so often that I don't go a day without it. I just want to be mid platinum again is there any way Riot can change my mmr and rank back to like platinum3??