moving wordpress to another forlder on the same server

Hi,
I was running a wordpress blog for a festival at this address:
https://na.pravi.me
on a server to which I have ssh access.
Yesterday I wanted to move it as a whole to a new folder and install a new instance of wordpress for the next year’s edition of the festival.
Fist, I created the folder where I wanted to move wordpress, then after quickly checking some instructions, I went to my wp-admin settings and changed WordPress address and Site address to https://na.pravi.me/belgrade011 where I wanted to move it. I also copied the complete worpdress folder into this new folder. However, I didn’t follow the instructions fully to also change media links etc, so what happens now is that the site displays without css and media, but it does work
The problem is – I cannot access my wp-admin any more, namely when I try
https://na.pravi.me/belgrade/wp-admin it gives error 404,
when I try the old one (which still exists on the same location on the server)
https://na.pravi.me/wp-admin
it redirects to https://na.pravi.me/belgrade011/wp-login.php?redirect_to=http%3A%2F%2Fna.pravi.me%2Fwp-admin%2F&reauth=1
and I cannot access it to change it back/forward/anywhere.

I tried editing DocumentRoot in apache settings to the new folder location or letting wordpress redirect it only, but both ways it doesn’t work. Getting a bit lost….

Can someone please give me advice what is best to do here?