There's currently only two ways to reach sage of 6 paths rank in DB.

1) be a whale. Like, 300k+ at minimum.

2) get help from a whale. a 400k running edo hiruzen is usually enough to beat under-300k's, and a 350k+ running a solid team (6p or bt kakuzu) can get you wins against 300k's. Ofc this depends on your own power; if you're barely 100k then the whale's gonna be doing a 1v2 against 300k's (300k is the 'average' player you're gonna end up facing; if you can't face 300k's and win, then you're probably gonna get a net loss or just stay put at your current rank).