To get better at lol and to compete in it and ofc win something

Hello!
im an ADC main who plays lol for 9 season.
every year when i come to plat in solo duo i stop playing beacouse i dont have motivation to play.
i dont think that im actually an plat elo player as u can check my opgg and see it for yourself
i have 20 years and i speak english better than i write it :D
i know that im pretty good player based on mechanics and understandind of the game but i also know that there is alot to improve.
i was never coached by a coach before so i think that would help me alot
i also play meta adcs now such as tristana jinx kai sa
and i was also playing in a team before but they didnt had time anyomore