TheMilflover
well I would suggest that he starts training physically also master things like haki , a weapon style and a concept based power as that what help to actually become a super devil rais's brother become destruction and anjka is like a control god who can manipulate the world with formulas ( does calculation instantly ) so I would suggest a consept like shatter eg he could shatter the world or area destroy people form inside out and maybe like shatter his own power limits to become stronger . other that that the fanfiction is quite good .