I know there aren’t many radiants in this subreddit but if any of you see this I’d appreciate some advice.

I just ranked up to Immortal 3 and 550 rr threshold seems too much to grind. What is really different in + 400rr than low immortal? What could carry me to high immortal? I can dominate games in low immortal when im in the zone but when i face 300-400rr players they literally destroy me and i generally bottom frag those games.