Frozen rank after winning

I have just finished another 7 wins in ranked mode and i haven’t got new rank ? I was plat 3 and what i have got is plat 3 ? Is it possible, is this how it should work ? If its because of mmr how am i supposed to climb ? Like i know that i have sh*t mmr because i have played more then thousands games, but i know how win games, otherwise i wouldnt hit master when i played OW1 last time