1)Streamlining the Special Atributes and Drama into Origin, and Origin Points.
2) Adding a lot of custom Gifts and Flaws. Possibly changing the rules on them, they will feature more heavily, could have even some kind of a tree(since you can have an open circuit, and THEN you can have a magus training, and only THEN can you really a Crest, every step being very beneficial to even people without magus background, but only crest having magi being able to cast proper spells worth a damn). Should be split into Gaian, Alayan, and Moon ones, with not every character having access to each. The basic idea is that Alaya gives access to everything based off Circuits in-universe, Gaia gives the possibility to gain superhumans physical stats more easily at the cost of hurting mental stats and making Alaya harder to access, and Moon makes it flat out easier to increase all stats, at an obvious specific cost.
3) Getting the game into a modern setting. Change skills into their modern variants and add the specific nasuverse skills. Add present day firearms. Add enchanted equipment. Possibly make schools of fighting in nasuverse a thing, knights just use traditional polearms and psychics train martial arts, but a School for Executors or a bare-handed one for mixed bloods would make everything a lot easier.
4) Work out magecraft properly.
5) Make up new material to add to canon as examples for GMs to use, while making sure it isn't against canon. Mark added material in the rulebook so people can avoid it. Will need a lot of outside help.
6) Balance it all out. Will need as much outside help as possible.