How do I increase max cost of my team 
I have absolutely no clue what you are asking to be perfectly honest so you’re going to have to expand on that.
For any meaningful feedback on your team, you’ll also really need to post whatever your current team now is.
I would also strongly suggest you visit the Rate/Build My Team thread here on the forum for advice.
Play online missions to upgrade your hero rank. The higher your hero rank, the higher your cost.
Max cost can also be increased by playing the offline story missions.Â
Some will reward you a raise in max cost!Â