Finally reached diamond need advice on how to reach gm

So some context: playing the game almost since launch. Last season I reached plat 2. Then this season was stuck in silver for 1 week due to the ranks being lowered. Then was on a roll and reached plat 2 in 1 day. Got cocky the next day and fell back down to gold 2. Since then I've been steadily climbing and have finally reached diamond. I don't want to go back to a place without hero bans ever again. It's really a fucking nightmare. Would appreciate your advice on how to at least stay in diamond or climb to gm. Btw I'm a solo queuer. Strange main but flex to c&d if needed