This is a question for veterans and new players alike. I'm relatively new myself (110 days of service).
Which hero did you cosmic prestige to level 60 for the first time? If you remember of course.

I just reached level 59 on cosmic prestige for Black Widow. Which has more or less been my main hero.
I've unlocked 14 out of 55 heroes (soon to be 62). Along with 6 team-up heroes total. It's a nice start for me.

I need one more level on Natasha to complete my first cosmic prestige hero. And then I can focus on end-game stuff. But in just over three months I've been able to notice a steady progression. I know what I need to do to keep improving. I have not gotten any G-balance yet to use in the in-game store, all free-to-play for me (it's what makes this game great), but I did receive some in-game gifts from a friend (all the Black Widow costumes), including the newest one.

There's no doubt if I had discovered this great game a year or two ago (closer to the early days), I'd have been even better right now. But I'm glad to have started during the end of Marvel Heroes 2015, which is now Marvel Heroes 2016, so I'm very pleased with the game.

Gazillion does such an amazing job with this game. Their staff may not be the largest but they work around the clock. They fix every bug, test every inch of the game so that it's the best, continue to make improvements and they keep adding new content. Seven new heroes are coming out this year. I can't even keep up with all of them.

Right now I'm just trying to increase my team-up hero roster. Once i reach level 60 cosmic prestige on Black Widow, I'm going to probably focus on reaching level 60 cosmic prestige for Captain America. But that's looking too far ahead. I don't know if I can do it because it's a tough journey especially when you don't have any of the experience boost potions.

Black Widow is my only cosmic prestige character right now. It may take me a week or two just to finish off this last level. I haven't played since reaching level 59 last night because I'm trying to mentally prepare myself for this one last hurdle.