do you guys think leveling up 37 would be a good idea

i dont know whether if i ahouls level up 37 to insight 3 because im saving materials for Igor, lopera and moldir, i know how hard it is to get materials in this game so i dont want to waste it. but i also want to level up 37 and put her in my ezio FUA team(i dont have flutterpage, im just scraping by) so i can use her casually. im in a dilemma