Is my iPhone 7 Plus worth the repair?

I had my cracked screen replaced on my iPhone 7 Plus about a year ago. It was done by a third party repair shop, not Apple. I had minor issues with the touch; nothing that I could not work with and ignore. It does tend to heat up doing minor tasks and especially with a cover (that I never had an issue with with my 6 Plus, and still don’t). Makes me think that there may be some hardware damage, but I am not sure. Recently, within the last two months, the screen started going black, with some pixels of white in a small line on the screen, but not in the same place each time. Then would go to the startup screen with the Apple on it. It keeps doing this when I use it. This phone is a lease and it’s about time to return it. My predicament is that I won’t be able to lease or finance another phone, so paying the $130ish to buy the phone and repairing it, may be cheaper than buying a new one (almost $800 for the same phone, not ready to get the 8 or X). It is a 256GB Rose Gold iPhone 7 Plus. Given the symptoms, should I even dare take it to Apple or another repair shop to see if it can be salvaged or is it not worth it? Thank you!