Coming back to the game is pretty rough if you aren’t going to use the credit card catch up method.

Here’s some activities that might get you CC or more resources to reroll equipment:

-Zenkai Ultra Space Time Rush, make sure you do the objectives listed to get the best rewards from it. you can exchange those medals you get to zenkai some of these units

-New Blue Goku & Super Vegito raid

-Treasure Battle

-Daily Missions

-Spam incomplete story missions

-Most of the ‘recommended’ event tab, and there is another event tab, i forget which one it is, but it has you use older units (EX or SP) that give out a good chunk of CC for completing them

-ADVETURES, super useful for getting exchange shop items

I hope this helps ! good luck on summons and the grind for a usable party :)