Long-term travel insurance? (UK)

Hey guys 👋

I planned a 6 month backpacking trip at the start of this year, flew to Thailand in January and have been travelling ever since, currently in China.

I originally purchased a 6 months of “backpacker” travel insurance for around £550 (pre-existing medial conditions + high value item cover 🙃)

I’m now not planning on returning home after 6 months and instead will be travelling long-term for an indefinite period. I’ll probably be in the UK for around 3 weeks in August and then I leave again.

How exactly does this work with travel insurance? My existing insurance is going to run out while i’m still travelling, can I take out a new policy while abroad? Is there any type of insurance where I can pay monthly and be covered? It would need to be worldwide as I will be travelling everywhere

Any information is really appreciated ❤️