Glorious Legend. Legend (26 stars). Just be able to adapt at all times. The struggle though is before draft pick. Anyway, it would be good to be on the last pick and always fill up the hole in your team. At least play one hero per type (Mine is MM - Miya, Mage - Alice, Tank - Franco, Assasin - Saber, Fighter- Alucard). And you are all set. Don't be a cancer. Be smart and adapt.
I reach legend in my first season solo queing because I had no one to duo with. Then second season I rank to legend by myself again and I reach 100+ stars with duo/trio. 3rd season I play half the time with team and half solo. This season I mainly rank with my squad because if I solo I get paired with 4 epics who feed the whole game(Our squad reach Glorious Mythic early in season)