It would be very good to see these changes since there are a large number of people who could get bored of an art, race or breath or simply try more.
BREATHING/DEMON ART RESET
Something that would be very good in the matter of resetting breathing and demon art is to remove the payments with 40 levels, since they already take time and effort to get them and add a couple of requirements to reset the arts or breathing, such as killing a a large number of NPCs or Players, there is also the option to pay with a large amount of money, which in this case would be yen, and if there is the possibility of another mechanic in the game to take this issue as a requirement, it would be quite great.
RACE RESET
In the case of demons, the possibility of being human could take a much longer situation, something similar to the event of waiting time and being able to race reset but with a specific anime NPC that would be TAMAYO, there would have to be some kind battle with a boss, collect human and demon blood (NPC Farming) by fulfilling a couple more requirements.
And finally, I would like to further motivate the developers of Demon slayer rpg2 who are doing an excellent job to continue entertaining their community.