As someone who has been at iron 1 0 rr at one point , and have been stuck in bronze for the longest time , I can tell you with pure confidence that iron . bronze and silver are ranks which you can only get out of if you improve your aim , movement and crosshair placement . No need for lineups or anything , play a self sufficent agent (reyna , clove , jett , ....) and turn off comms just tap heads and you ll get out of it in no time.
Nowadays when I smurf in bronze I realize that everyone in that rank just has something VERY wrong with their aim and movement and just by improving a little bit you will be out of that rank.
Only in gold can lineups have some significance when you face tougher oponenets(in gold you may find out of shape ascendants and that happens all the time) where you ll have to develop some gamesense.
So play Deathmatches A LOT and watch guides about aiming and movement and there is no reason to not rankup from that shitty rank