How to make existing React to SSR easily

I’ve developed a large project using ReactJS but it currently scores only 30 on performance metrics and struggles with SEO since it's primarily JavaScript-driven, resulting in poor indexing by search engines other than Google. While using Vite, I've been informed that enabling server-side rendering (SSR) requires some changes to settings. However, I fear that switching to frameworks like Next.js could result in needing to rewrite significant portions of my existing React codebase, diminishing the advantages of SSR while still relying on client-side interactions.

I built a large project based on ReactJS that faces speed and SEO issues, specifically struggling with indexing beyond Google due to relying heavily on client-side interactions.

Upgrading to a framework like Next.js feels daunting because I have to adapt existing React code, yet I need to improve speed and add SSR.

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