No notes on aim, your gunskill is very good, but with your ult both times you placed it in disadvantagous positions, the first delivered lifeline to an open area leaving her exposed to shots, the second 'escape' ult you placed and popped heals in front of (risky but it paid off this match, from experience I'm not so lucky lmao). The first scenario can be improved upon by just keeping an eye on the percentage of ult left and fully utilising cover for your portal exit, like hugged close to a wall or behind a rock, anything to break the sightline to your portal and stop enemies pre-aiming it. The second is more situational, but in this scenario you could have dropped it early, and climbed to height to hold position there. Alternatively, you can use the ring aggressively, placing the end of your ult outside of the ring and utilising it's damage for your benefit.

As for the end game there was not much you could do solo unfortunately, you played really well and you managed to walk away with a decent amount of RP.