Even if you didn't take PPI's and even if you were diagnosed with Barrett’s chances of getting cancer is small. It can give a lot of other problems if you have GERD and are not treating it.
Taking PPI's should reduce your acid production enough to protect your esophagus. If you still have LPR I guess either you still have too much acid or you get LPR symptoms from regurgitating non-acid stomach content. If the latter I guess you are ok except for the LPR but if you still get acid in your esophagus you should explore other options to stop it. Some PPI's works better for some people than other and some even mix in H2 blockers.
Either way. I am no doctor and can only share what I think and what makes sense to me. I would definitely recommend you to talk this through with a real professional either an ENT or a good general practitioner that understands GERD and LPR
Best of luck