Looking for a coach willing to help me

Hello, my name is David. IGN : LIDL Feeder. I've been playing League for about 4.5 year. I started playing in the middle of season 4 and reached lvl 30 at the end of the season (December). But I gave my very first try for this game season3. Been playing all lanes and finding my favourite ones where I can do most of my performance. It's Mid/Support and I have some knowledge about jungle. Anyways as I said I've been playing League for a long time and I don't feel anymore improvements besides that I managed to climb from b5 (s5) to p5 (s6). Now I'm at D5. (Peak D3 100LP). I never had a coach that would tell me my mistakes. There's a reason why I'm hardstuck D5. I hope there is someone that (highter than my rank obvioudly) would help me and give some tips and tell my mistakes and if every decision I do is okay (since I can't tell if they are right no one is there to tell me that). It would be awesome if you could spectate atleast one of my games and analyze it for one time. I really prefer someone who willing to do this for free. Please add me IGN : LIDL Feeder.

Btw don't mind my horrible English. Lithuania is my native language.