Finaly i deal millions of damage...now what?

I just finished my mirage build and dealt my first 1.000.000 with my (poorly built) cerata, been testing it's limits for the past 2 hours and concluded that now i can deal 1.000.000 - 9.000.000 damage, sometimes i can even get a 12.000.000 Orange crit. I always wanted to be strong and finaly am...but now what's left, lol? I'm thinking about trying grendel now cuz he seens like a fun warframe, but probably gonna try some stupid off meta build since i'm not a big fan of just nuking the map. Maybe i'll try some fashion and interior desgine from now on.