Some people liked the old you mostly because the old you was convenient for them.

Not all resistance to your changing is about concern for you. Some of it is about an arrangement you were part of, which worked for somebody because of what you used to agree to, and a changed version of you breaks it. That does not make those people villains. It does mean their objection is evidence about the arrangement rather than about your decision.

When somebody pushes back, ask quietly what changes for them if you go ahead. The answer tells you which kind of objection it is. Take the ones that are genuinely about you seriously, and hold your ground on the rest.