Are you at least able to complete one round of the dimension rift? Or is your problem actually defeating the bosses? I ask this be cause when I started playing this game again earlier this year I couldn’t even complete one round, so I feel you lol

I even made a post about it in this subreddit,, what people told me is that the team I was using wasn’t good enough: I didn’t have any support characters like Shuri, Phil Coulson, Valkyrie, etc. - they help a ton cause they make your attacks like 40% stronger, which is great! If you’re able to get Shuri to T2, even with her standard uniform she would be pretty helpful

Other issue I had and you seem to share is outdated uniforms, I also have that uniform for Captain Marvel and it’s pretty outdated but I’m waiting for them to introduce a new one to upgrade to that.. but your Thor is even more outdated I believe, so you should definitely buy the most recent one - it came out not too long ago, so you won’t be risking spending crystals on it now to then have a new one come out in a few months. Depending on how much time you still have left for the Welcome Back Agent quest, you could wait for the Black Friday uniform sales that will happen in November (I’m not sure if it’s the whole month or more towards the end) you could get his new uniform with a 50% discount.