I have a host that I want to switch to and they told me that I can only have 1 database. This is a wordpress website that also has a xenforo forum on it, so I have 2 separate databases. Can you merge both databases together?
Yeah, I have a host that is managed wp hosting. I was kinda shocked too when they told me I could only have 1 database. No big deal, lots of other hosts out there for just this site I can move it to.
WordPress runs from a table prefix so you could in theory, but please don't. Just move host as others have suggested. A compromise on your WordPress site would put your forum at risk and vice versa. Ideally they would be on entirely different sandboxed file systems. I love WordPress but with its plugin ecosystem it is easy to slip-up and find yourself vulnerable to exploits.