iMac folders missing after Apple ID email update

I recently updated my Apple ID email address and now all of my desktop screenshots and document folders have disappeared.

I have an IMAC using Monterey 12.7.6

I asked ChatGBT who suggested it may have something to do with my iCloud?

No idea where to start with regards sorting this issue out.

I run a business from home due to a visual disability, and we have been trading over 10 years, so I have a huge amount of 'paperwork' (Yes Im old!) on my pc, which I cannot afford to lose.

Any help anyone can provide with a solution, or point me in the right direction will be gratefully accepted.

Many thanks in advance 🙏🏼