Will I lose my hair gains if I shave my head?

Been on Min (and Fin) for 7 months and have made some nice progress and got my hair to grow back on the crown and temples, but if I shave, is that like pressing the “restart” button? Do I have to wait another 7 months to gain what I have back?

No, shaving your head will not cause hair loss; however, miniaturized hairs which are not growing well, may not be growing when you let your hair grow back.