Assuming the application code is mostly stateless (it pulls all the data it needs from the database on every request), this kind of app is usually not a big deal to containerize and put on some cloud platform (AWS, GCP, Azure should all be about equivalent) and even get more 9s and scalability almost for free. This is essentially the Wordpress architecture, which every infra engineer (née sysadmin) in the industry has been asked to move from on-prem to cloud sometime in the past ten years.

If the application code has non-disposable state in-memory then it's bit harder but can usually be done, especially if it's low-traffic enough to comfortably live on single Rackspace dedi now.

Edit: I should also mention that if you're looking for somebody to do this kind of work for you, there are contact details in my profile. ;)