I guess you could try cleaning under and around the button with Q-tips and rubbing alcohol, in case some
eliquid collected on there and got it stuck? I wouldn't um, dig too deep.
It is possible that well, your
mod is broken, also. You could take it to a vape shop if you have one near you to see if there's a staff member who may be a bit proficient with electronics.
How long have you had it? If it's still under warranty you may be able to do that. If none of the above works, I'm afraid you may have to replace the mod.
Good luck and welcome.
Anna