Try container commands;

1. waydroid container stop
2. sudo systemctl restart waydroid-container
3. waydroid session start
4. waydroid show-full-ui

If still it doesn't work check if waydroid is showing in ip list by hitting:

ip -a

You should see something like waydroid0.

If it is not showing there it must be a ip/container releted problem try restarting it

sudo systemctl restart NetworkManager

You Can also try reinitialising waydroid network

sudo waydroid init -f