From a professional perspective I’d say: don’t rewrite if you’re unsure about it. Rewrite if there’s a particular problem you need to solve and a rewrite is the only way to do it.

For example, you need to make major changes in the tech stack. Like switching from PHP to NodeJS. This is difficult to do without a complete rewrite.

Rewrite for the sake of rewrite is usually a waste of time, and it’s not certain that the code will turn out better in the end. You might end up with a similarly convoluted system either way. And the worst part is: now you have two systems to maintain at the same time.

Likewise, refactor if there’s a particular problem you want to solve. Don’t refactor just for the sake of refactoring. If you don’t have a clear goal, then you’re just scrambling the code around.

From a hobbyist perspective: do whatever you feel like. A complete rewrite can be a good learning experience.