There’s an area of research producing “quantum ready encryption”, which uses algorithms that are believed to be secure against quantum attacks. There’s been no wholesale migration to this yet, and the protection remains hypothetical until the attacks actually happen.

Seems like there’s some good advice already in this thread for what might come next for you. I had no issues with the website on my mobile. (I like the aesthetic!) Props to you for choosing a tech stack and a goal and putting something into the world 😄 Keep it up!