When is it time to lower my aripiprazole?

My CMHT is discharging me this month (fair enough, they’re not really helping) so my GP will be prescribing my medication.

I am currently on 15mg of aripiprazole (amongst other things) but as part of the discharge plan the psychiatrist wants me to aim for 5mg for maintenance, and to go back up only if I have an episode or crisis. However, I will have to proactively approach my GP to ask for any medication ups/downs, so — how will I know when I am well enough to lower it down to 5mg? What signs should I be looking for that say “I am doing well enough to only be on a very low dose now”? I don’t want to mess it up too quickly as I’m finishing off my masters and simply don’t have time or energy for a psychosis right now!

Thank you!