"Page Not Found" + Too large of a code

So recently after a 1 month break I tried to log into my app that I created and I was greeted with ‘page note found’ and it prompted me to go build another app as my app doesn’t “exist” anymore, but I checked google drive and I still have the exact code.

So orginally I thought it’d be best to copy and paste the code into a new builder just so I can rebuild the exact, the thing is since I poured alot of time into this app the code is around 1900 pages long, and google ai studio does not take such a long prompt.

I know it seems that I should break it down personally but breaking a 1900 page document into 10,000-15,000 character per prompt would take ages.

I am stuck and do not know what to do any advice.

(I tried GitHub and giving the link but thats also to big for the ai to digest) Any help would greatly be apperciated.