One thing you should do is grab your data for easy moving, you haven’t already.

Assuming you’re using the default Lemmy web UI (not Voyager, or Photon, or a mobile app, or whatever), click on your username in the top right, and select “Settings”.

On the settings page, there’s a section called “Import/Export Settings”. Click the “Export” button and let your browser download the file.

Then, when you switch instances, you can go into the same Settings page on the new instance, select the file you downloaded, and hit “Import” and you will automatically be resubscribed to the communities you subscribed to.

If you aren’t married to Hugo as your solution, I will recommend giving Eleventy.js a look.

It’s a static-site generator, but a good amount of flexibility is afforded by virtue of using pure JS to generate view data (which means that you can do any conversions needed, manually or with NPM packages if needed for more proprietary data formats), and it supports a bunch of templating engines too.