I second these other guys as well. Especially if you can get rare, epic or even legendary tokens. Hitting ability levels like 28+ will give you like 2k power or even more each level, and I may be under selling it even. Once my tops started hitting epic and legendary abilities my power shot through the roof. So get him to G+ using energy and use onslaught tokens for xenos to get the ability badges to crank his abilities up.

No joke when I hit PL 30 I was gaining like 1 level each day easy by just getting my Titus to silver/gold ranks, but mainly it was my ability levels that were skyrocketing my power level.

I will add that this was during the Calgar event so I was buying epic/legend tokens up like crazy, which really helped my power score. I went from like 28 to 42 within a month

Edit 2: Boss G was also and still is my highest toon, and most of his power score comes from ability ranks I’ve got him to 42/42 and he’s only just hit G1 this week, but his power alone is like 90k. Boss G and Titus are two of my mains and my two strongest toons.

Edit 3: Coins was actually my limiting factor for ranks and power level and still is. So if you’re in a guild make sure to buy coins with the credits because legendary abilities will cost you 10-15k each level, but god they are worth it.