Why has my website traffic changed drastically since January 2024?

As of Jan 2024 our website traffic has changed dramatically. Prior to, the highest ranking countries were USA, Australia, Canada and the UK. Now, I have had only a tiny amount of traffic from the UK, over 2.5k visits from Indonesia (had almost zero traffic from here in all of 2023) and now I’m getting most daily traffic from N/A for country/region (have never seen N/A before). Any clue what could be going on? I’ve got a geoblocker app in place for Indonesia but can still see visits. No idea why UK traffic is now zero and what is N/A? Thanks!