Audiophile website with TS, React, Sass and headless CMS

Hey!

I just finished it, and I'm quite happy with the result (it was a big project). But there are probably lots of possible improvment.

What advices can you give me to improve code/style/accessibility?

Moreover, I have a small problem with my backend: when I load the website for the 1st time after a long time, the server seems to not respond to the 1st fetch (I have a 404 and 401 responses)... All the following fetches are okay after that. I used Strapi hosted in Railway. Anyone have an idea where it could come from? Maybe the Railway server is put on standby after a time or something like that, is it possible ?

Thanks in advance for your advices/comments!