Just realize you cannot update your OS via APP store, but need to search on apple website to get OS 10.13. Successfully downloaded and updated my OS to 10.13.6. It's a bit slow on everything comparing to old OS but it WORKSSSS!!!
If anyone has the same issue as me, you can try upgrade your OS to 10.12 and give it a go. Maybe your MAC will run faster.
If your MacBook Pro has a standard hard drive, probably a 5400 rpm one at that, replacing that drive with a ssd can make it seem like you have a brand new computer and also upgrading the ram to at least 8 gb can make a difference as well, but not near as much as an ssd will.