Several issues here – not sure which is the root.
1 – WPBakery Frontend Editor would not load – I just got the WPB overlay on the page. So I tried disabling Gutenberg as recommended on certain WPB forums. No luck. I thought maybe the memory allocation was too low so…
2 – Tried setting PHP memory_limit to 512M, which has helped with problems like this before (esp with elementor). No luck. But I noticed that the PHP version is 7.2 so tried changing that to 7.4 and….
3 – Page will not load at all – I simply get a 503 error.