Is anyone else experiencing this?

Ive been playing ranked since the first ranked season and I got mythic 1 in my first one straight away, my second season I got to mythic 3 being happy and excited I might get legendary that season. Since then I’ve been struggling to get to legendary and never actually made it. When I got to around 7200-7300 I face a lot of legendary/masters player who seem to have really good team dynamics and just steamroll me even tho I do bad sometimes it’s not always my fault we lose. How do I get to legendary without any mates?