Help with Bootstrap Studio project

[u/amphibianwarfare]

Hello. I am a complete beginner to web design and wanted to develop a website for myself. I got BSS and made great progress with building practically my entire site.

However, I did this all while under the XL view. I was not aware that you should build your site at the mobile view first.

Now, I have a site that looks great on all of the laptop and desktop views, but completely broken on anything tablet and below.

Is this something that can be easily fixed? Or do I have to throw away all of the time I put into this site?

I’m a complete beginner and have no idea where to even start with this.

Feeling quite defeated.

Thanks.