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This is not a conventional way of exposing something to the Internet since it’s not publicly facing the Internet (the only way right now to have access to your apps is to know the IP of the server, username + password of the SSH account).
Also, you’re running the server in dev mode here, not something optimized in terms of speed.
You will need to use yarn generate (or yarn build) then yarn start on Netlify, Vercel or any platform like that for your Frontend (free service usually if using SSG).
Here is a whole list of places and how to host there for the frontend: https://nuxtjs.org/deployments
As for your backend, you may host it on Heroku, Render.com, Railway or any place of your choice (with a Node.js available).
Even a bare metal SSD can be good for such but it will require more setup overall.