Thanks for the comments you all. Well, my lower php has to exist cause a higher level will mess up my forum. However, my forum has messed up anyway. Are you all sure it's not about increasing php capacity?
I also operate at a lower php for another one of my forums (not XF) but it is still working.
I was using the ea-php when I was supposed to use alt-php, because they were using cloud Linux. The hosting fixed it The error logs was in the public_html directory.