Like already said by others, your problems likely started with keeping/restoring incompatible settings from 19.07.
Regarding wrt32x, please be advised that the mvebu mwlwifi WiFi is somewhat more unstable with 21.02.1 than with 19.07.x releases.
The reason is an upstream Linux bug that was found by OpenWrt two months ago. The bug has already been fixed in master and 21.02 branches, but not in the old static 21.02.1 release. Link to discussion below.
If your family already had WiFi connectivity trouble with 21.02.1, you might stay with the (ok working?) 19.07 until the 21.02.2 with the fix gets released.
The other option is to sysupgrade to the daily 21.02-snapshot. Link to the 21.02 snapshot in the discussion below.
Edit: I think that the 21.02 snapshots actually have LuCI, so I removed the part saying that you might need to opkg install LuCI manually.