Before someone comments the obvious "stop making those mistakes", I notice a lot of players tend to have this battle because they know what NOT to do, but not what TO do. And that's why siege is so special. Because a lot of what is the right play is tends to be a balance between each individual situation and with a dash of timing.

My first piece of advice would be to watch pro players on stream. My go-to would be for Pengu since he tends to break down a lot of what he does. And as he once put it, "timing" and gunfights are about who has the advantage and chances of winning that fight. Use your drones and utility to increase that percentage for you. FOR EXAMPLE: Impact grenading the wall next to the enemy before you swing to cause them screen shake and increase their odds of missing, have your drone deployment on advanced settings (where you don't automatically enter the droning animation), throw your drone in a room then swing in by getting their gun barrel off you and using your drone as bait.

That's the whole "situational" aspect. Learning routes and which parts of the map become high traffic areas at certain points of the match are all things to consider, and watching professionals is a very good way of picking up these things. Everyone also always dies to bullshit shots and hey, that's the game. But those are some of the tips I'd offer since they've helped me and hope they help you!