When the EHCP ends - what then?!

Does anyone have any thoughts they’d like to share on what to do when a young person’s EHCP runs out when they reach 25?
My son isn’t far off from this happening - and it’s quite a worry. He has a little support at the moment with online one to one tuition - but this won’t be funded once the EHCP ends - so that will finish. What happens in terms of support and help for young autistic adults when their EHCP ends? Is there basically nothing?! No help or support at all?

If anyone has any advice or experience with this I’d really appreciate hearing how people dealt with this. Because I’m not sure what we’re going to do. Thanks.