Playing and wining competitive maches

i am a young apex player, i play since launch. I started on PS4 but I've been playing on PC for a year.
From the beginning I see competition and I have become familiar with the game, rotations and plays. I want to venture into the world of competition.
I have reached diamond but I know that I could reach much higher since I don't have a team nor have I played with partners, all my life I have played as soloQ and I have taken the role of iglo.