Project won't load, getting 503 error

I made a remix of the Eleventy blog template, and was able to use it when I initially made it, but a few hours later, I tried to use it again, and wasn’t able to get it to work. This has continued for multiple days. The project won’t ‘wake up’ and will just load indefinitely until I get a 503 error. Very occasionally, it will load up once, but the changes I make to the code won’t be reflected on the page, and if I refresh, it’ll go back to infinite loading. Is there a way to fix this?