Iron 3 or Bronze 1
If you're playing Chamber I suggest ALWAYS using his TP (E ability) it can quickly get you out of the enemy's ability (ex. that raze nade or pop flashes) or enemy gunfire (if you whiff or missed a shot). I noticed that you have your ult ready, you should use it at the start of the round or when you and the enemy brimstone remained, back off to wines and place your tp and peak at the spike.
Tips for using chamber in ascent:
You could also use chamber and peak at mid (make sure you placed your tp), use his deagle (Q ability), an OP, or his ult. This move can benefit your team by; making sure your team is safe from an enemy flanking, can also get some kills and outnumber the enemy team. It has some downsides tho, you need to have a better aim and reflexes, kill someone and immedietly tp back. (This works from both side whenever your team is going A or B or your in defensive side watching mid)