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Depending on where you’re hosting your code, you could use ISG: https://youtu.be/4vRn7yg85jw
There are several approaches of solving that yourself too, but it will require some work of course.
Nuxt team is currently working on solving this issue with something baked in: https://github.com/nuxt/framework/discussions/560
You could maybe also optimize some of those pages or look to split them in different projects as told here: https://stackoverflow.com/a/69835750/8816585
Batching the regeneration could be an idea too, or even using the preview feature to avoid some useless builds: https://nuxtjs.org/docs/features/live-preview#preview-mode
Overall, I’m not sure that there is magic solution with a perfect balance between SSR and SSG as of today without a decent amount of work. Of course, if you’re using Go + Vite or alike, you will get faster builds overall but it’s a quite broad/complex question overall.