Believix Headcanon:
I don’t really like how season four went about believix as a higher power than Enchantix tbh it could’ve worked better if it was an earth fairy’s alternative to Enchantix because believing in magic is something that would make way more sense on earth a world that is probably more lowkey about its magic than say the magical dimensions where magic is everywhere you look so it is pretty hard to just straight up not believe in it.
For this I had the requirement be the where they need to be believed in very strongly for the transformation to occur but I would actually have it that Roxy didn’t fully believe in the Winx so their believix was as a unit very incomplete and throughout the season each Winx would gradually get closer to the people around them allowing them to believe in fairies this would allow them access to those special therapeutic spells which are probably an earth fairy’s version of fairy dust probably idk it would make the form come off less like Manipulating and forcing people to believe in magic if the Winx got a gradual boost and rise in power the more their presence began to make the people around them on earth believe in magic and believe in fairies.