Looking for SEO Advice.

I need some SEO help. I have set up my website (if I am allowed to, I will post the URL or the name) and I had some PDF files there. So, I went to the Google Search Console and did all I could think of. I remember adding a custom file suggested by the website listed steps. I remember setting up some sort of DNS setting. Here is the deal, though. It is a next.js project and the hosting provider is Vercel. Maybe that has something to do with its poor perfor