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Directus
The Modern Data Stack 🐰 — Directus is an instant REST+GraphQL API and intuitive no-code data collaboration app for any SQL database.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Also, if you evaluate alternatives, consider directus. It's imo superior to strapi, as it supports SSO and doesn't have capped role numbers like strapi.
If you decide to go with Next.js and GraphQL, then look at Faust.js. Its a framework for WP frontend built on top of Next.js by the folk over at WP Engine. Its set up to work with GraphQL and it takes care of some of the gotchas like wiring up post previews with the frontend so that that functionality keeps working.