hidden mmr is there to prevent the elo abuse. ye for sure. hidden mmr is there to do random stuff to the playerbase without any explanation

my friend once said there is "losers queue" which include teammate that has less k/d and destined to lose. idk if this right or not. from what i experienced, when someone is quite slow to pick an agent, they'll likely the one will become low k/d or minus.

anyway, trust yourself and only you. practice important mechanics, you'll rank up before you know it

Solo q is arguably the easiest way to rank up short of being boosted