Couple things. Firstly watchtower is no longer maintained. An alternative is what’s up docker(WUD). It mostly functions the same but with a little more setup.

Secondly as someone who’s consistently had a hard time with searxng, I would recommend degoog instead for aggregate search. It just feels so much more modern and usable. It’s immensely more simple to setup as well since configuration is mostly done in the interface instead of some several hundred line config file.