My Moto z2 force won't turn on, at all.

Okay, so my moto z2 force was on 16% so I decided to plug it in accordingly as I was still browsing the internet. In turn it shut off, then would display the moto welcome screen as if it was turning back & vibrate then turn black, this repeated for about a minute until not it just will not turn on at all. This happened before which I had gotten a new phone and put this one in my drawer for a few months… my “new phone” broke so I decided to check for some reason if this phone (moto z2) was back working and to my surprise IT WAS! So I put in my new sim card and it worked for a few months and now did it again. I really need some suggestions as to what I can do to fix this. I need to access this phone as it has all my court information etc. on it. And I unfortunately am without a job or income so a new phone is not even an option. Please HELP!