Vercel is the company behind Next.js and their platform is highly optimized for it. Create a free Vercel account to deploy your code.
Note: When deploying to Vercel remember to add your vercel deployment domain to the authorized domains within your firebase app project, to ensure that your Google Sign-In works. Add the domain in the format {ProjectName}.vercel.app as an Authorized Domain under Authentication / Sign-in method / Authorized Domains