What do you mean? could you be more precise?
there's a 1.21 version for fabric available on Modrinth.
Please note that updates are not backported. changements made on 1.21.3-4 will not backport in 1.21 version.

Unless someone unofficially backports them. See https://github.com/celestialfault/WildfireFemaleGenderMod/tree/backport-fabric-1.21

Oh..., just because other mods after 1.21 are very unstable, I just want to ask if there will be a 1.21 update?