being the best version of yourself doesn't mean being perfect (something that is unobtainable for every person and being to exist). working towards being the best version of yourself might just come in baby steps. changing small things that you feel like you want to change, and if you don't feel like something needs to be changed, then don't worry about it. it could be anything really, maybe something that personally affects you or stuff that affects other people.
hope that all makes sense. no reason you can't start now even if you don't think you'll get there by the time you intent to ctb.