-Think critically, what did I do wrong, how can I fix it?
-May not help, but practice your aim in the range, drag shots, twitch shots. W. E
-Map awareness is key, it can be easy to spot a flank from ur gamepad or if things are too silent check around to see if ur getting flanked.
-For SZ u should constantly he moving for the most part, being a sitting duck makes u an easy target in this mode. For tower control, people focus so much on the tower that they ignore their surroundings. Use this to your advantage
-Don't take defeats too harshly, EVERYONE loses, and lots of good players have bad losing streaks.
-objective over Kills. If u kill 2 ppl and die but they get tower or zone, it isn't worth much as they can recover quickly. I try to avoid dying as much as possible, which means avoiding over extending for a 1 for 1 shootout draw or taking out 2 and dying while ur mates aren't there. If your teammates are not there, u will not be able to capitalize on the kills. Time things correctly.
-Attack from different angles, ur mates go from one entrance while go through another entrance. Either u get easy kills from distracted opponents or they are more dispersed making it easier to defeat them than getting sprayed at from one entrance
-Be sneaky. So many times I have been able to get quad or triple kills because of this, even in A+ rooms this has worked. Most players lack good map awareness, making it easy to flank if u r somewhat deceptive and pick your spots correctly.
-Look at the load out of the opponents team at the beginning of the match, what are it's strengths and weaknesses. How can your weapon and role bring your team to victory. Pay attention to your teams load out to, to see where it falters and succeeds.
-Learn your weapon role and stick to it, mostly. Learn it's strengths and weaknesses. Learn how to handle different weapons and what position you are most effective using the weapon.
-Don't worry about it too much, if you let it bother ur mind ur progress will be slowed down. It's a process and patience is key.
Kinda a lot, some info may be incorrect but I hope it can help ya! :D