server side rendering? or nah

reroute to external domain from react router

<Route
	exact
	path="/"
	render={() => (window.location.href = "https://youtube.com")}
/>

how to implement ssr on react without next.js
migrate react to next js

just use react snap
https://github.com/stereobooster/react-snap
crawls your proj at post build and generates html files for crawlable urls

good refresher
https://velog.io/@byseop/SPA%EC%97%90%EC%84%9C-%EC%84%9C%EB%B2%84%EC%82%AC%EC%9D%B4%EB%93%9C-%EB%A0%8C%EB%8D%94%EB%A7%81%EC%9D%84-%EA%B5%AC%EC%B6%95%ED%95%98%EC%A7%80-%EC%95%8A%EA%B3%A0-SEO-%EC%B5%9C%EC%A0%81%ED%99%94%ED%95%98%EA%B8%B0