premiere pro, macbook ,

not sure if that's true.  If you can find a high sierra boot disk on an external hard drive, and can clone it over to your macbook pro, it may work.  First try connecting the external drive and restarting the macbookpro while holding down the option key and see if it will allow you to boot from it.  If it does, you can clone high sierra to your internal drive using a program called carbon copy cloner.  Although high sierra will not install on my 2009 macpro tower, I was able to actually boot from a high sierra drive and its been working without issues.  The fact is, you'll eventually need to buy a new computer, but this may work in the meantime.

see if davinci resolve will install.  It's free and although nowhere near as well designed as premiere, it might work for you.   You might also go on Ebay and see if there's an earlier version of Premiere available.  premiere cs 5.5 or 6 might work but you'd probably be wise to do some googling to see if it's a smart idea.

But just remember formats have changed a great deal in the last 10 years and if you're using a newer camera, you might be s.o.l.

Adobe Premiere Pro CC System Requirements

You cannot download versions older then 2019 anymore.