https://f95zone.to/threads/rpg-maker-save-editors.51/
These are the "usual" RPGM save editors. To change variables and switches you have to enable them in advanced options. 42821 works for this game, or at least for me.
Edit: also all these are in japanese, so you will have to look for your original score and change there after, like I had insanity 154, I looked for 154 and boosted it to 200, if it hasn't changed, then go back and change something else. Sometimes variables doesn't show until you have at least 1 or more value in it, I think?
Always back-up saves, not that I do but
So they say