Sometimes is not that you have skill issue, it's just that your current character doesn't have the tools that your current Team needs right now
Many players have to understand that swapping characters it doesn't mean that you are not helping, sometimes your current character doesn't brings the utility your Team needs right now.
I just had match where I had to DPS, I picked Moon Knight, we were doing fine until the enemy team picked the 3 healing comp, we had a Hard time doing final hits due 3 healing ults while us only had 1, so I decided to swap to Squirrel Girl for some Burst DMG and we finally won due her ult and heavy DMG was able to pressure the backline more often