IHaveNthToDo
you know like harry potter occulomancy and fate stay night thought acceleration and mind rooms stuff like that and for energy efficiency he could take some ideas from naruto with the leaf sticking wall walking and dagger spinning things elemental manipulation or world laws like all cultivation world have and with where he is those would be wind and space you know things like that ...... those are just off the top of my head
he should do some cultivation if not to save up some spirit energy for when he gets his ring to jump some extra levels then to try experimenting with some new cultivation methods that will be better than what he has and use the healing area if he messes up and to try purifying the spirit energy he has or to make his foundation so sturdy he would be able to take cultivation crippling shots and just shrug them off it would probably help immensely for getting higher level rings
It’s a good idea for a story but how will it even progress. Ik the title and all but with the difficulty of the system and how he’s only rank ten and it’s all ready this hard he will stand no chance against any of the main characters who are all monster genius’s. they all cultivate at ridiculous speeds. Plus by adding numbers to his strength just makes everything complicated.