learn how to make a basic website in some flexible programming language like go, rust or python (django)
make a list of functionality of your original website you want to provide an alternative frontend for (as a start, you can expand later)
find a way to retrieve all important data for the most important functionality reliably
implement it into your website
make it fancy, expand functionality, use the same webpaths for you website like as the original (so it can easily be redirected with libredirect or similar)
everything beyond https://motherfuckingwebsite.com is worse imo