Best way to climb up elo without tilting?

First step : Mute All , im pretty sure at your elo mates never use the chat for communicate, only flaming, so just mute the chat, and ping if players are spaming, you will be more focus
Second step : stay clam and relax, a game is just a game, you will loose and win again and again, you have winstreak and loosestreak , its the same for all the players
Third step : be lucid and yourself and improving ! watch a lot of replay, stats, comptitions, esport