I am currently running a team of Thor (Lv. 50), Juggs (Lv. 40), and Capt. America (Lv. 40+).
So far (with Boosts) I can dominate my level brackets and up to Lv. 75 without a problem but I am looking for a GOOD team or should I stick with what I have?
Thor/O. Widow/Wolverine is the golden standard for 2* teams. I would try to transition to that team, and eventually a 3* roster: juggs low level cap isn’t going to cut it later in the game, and cap is generally bad for pvp. It would be helpful if you posted your entire roster to see what you can build.
If you could provide a list of characters and skill levels I believe we can help you better. Just looking at your team at a glance, I would say that it seems that you have not covered the colors adequately. A 2* team, unlike a 3* team works better on synergy (my opinion) and you seem to have Thor and Juggernaut’s skills overlapping each other (red and green). Also, Captain America is more of a PVE character, thought I haven’t used him enough in PVP to know any better.
As for suggestions, with the information given I would say leveling Thor is your top priority right now. Get him to 85 asap. Get Wolverine or Classic Storm (or both) in your team together with Thor and you should be ready to advance to a 3* team.
I don’t like selling “obsolete” characters: you never know when they’ll come back buffed for a tournament. The amount of iso gained back (4k max for juggs) is insignificant in the long run anyways, so you’re better off holding it imo.