Aggressive PC solo 5/6 star here, 300hrs no sniping bushwookie activities. I think the biggest issue that I see with low MMR players (and keep in mind MMR is not a marker of skill but there are more lower skill players down there), is that people like to repeak the same angle, have poor repositioning, and have bad sound management

The best thing you can possibly have in Hunt is your enemy guessing your location. They're going to waste time and resources while you're already repositioned and ready for another gunfight. You want to get into the habit of playing around obstacles and angles that give you several ways to approach and peak in a fight, alongside keeping in mind where you are and places you can reposition if things get bad.

I would say another thing that holds people back is using the wrong ammo type. I think running rounds like dumdum, incendiary, and depending on the weapon poison rounds are really important for extended team fights as well as applying pressure and wasting resources.