So as someone in IT,
What is the purpose of rebuilding symmetric encryption solutions again and again?? I can write one using SECRETS module in Python too, no GUI because I don't want to learn it.
I can just use 7zip, Gnupg, or AES Crypt, or Veracrypt (if I put files into containers!!)
Nobody is going to trust it unless you fund audit or wait like 10 years. There is no advertisement in search engines, so nobody except Reddit users will even know this sites existence. If you want to rank up on the list you need money, which I doubt encryption can pay your bills.

For me it feels like an unpractical student project alternative than me teaching another human being how to use Veracrypt.

What prevents you from modifying the code after 10 years and do an attack like Hushmail??
https://www.zdnet.com/article/hushmail-betrays-trust-of-users/

True, those software don't use Argon2, but I can compensate by adding 2 characters to my password and "slow down" brute force attempts by 62*62 times.

https://imgur.com/a/1runKi8