If you’re in any western democracy you should worry about propaganda bots from Iran, DPRK, Russia, and China.
They have well known active operations of helping fuel the flames of political division by amplifying both sides of extremely divisive topics.
If you’ve ever engaged in flame wars about abortion, brexit, Scottish independence, the Ukraine war, the Gaza war, etc, there is a really good chance there were many participants from one of those parties.
Everybody spies and attempts psyops campaigns. I am much more concerned about nations that actively and massively attempt to exploit US election interference: Russia and Israel.
I worry even more about native propaganda bots honestly. Just because they are native it doesn't mean they aren't pushing a massive agenda, and they have even more motivation to do so.