Whats the point of SBMM when...

This Game i’m trying so hard to enjoy but it has taken a dive for the worst. My kd has steadily gone down from 1.64 to 1.55 and my win loss has dropped from 1.30 to 1.09 In one day. I get a decent team and win about 1/30 games now. Ive also noticed on almost every game my team is short 1-2 players and other team ALWAYS has full team. No one plays objective anymore. I’m 98% up against teams that are pub stomping and there is absolutely nothing i can do about it. Only enjoyment now is if 3-4 friends are on and we do fine. But public wise i think the game forces you be brought down. I dont care about kd but losing 95% of your games just kills it for me.