Not to point out the obvious - but why are you transferring directly from high risk merchants to EMIs or Banks in the UK? Europe / other?
This is automatically a red flag and the compliance costs just make clients like that for low cost focused banking untenable hence de banking.
You’d do best to utilize a high risk merchant that you pay the fees (higher) to process you into the banking system - they charge more because they are running higher compliance processing - once they are satisfied you can then transfer to normal banking that is reliant on the high risk processor to︀ have carried out the verification and can lean on that to cover their own arse︁ whilst not having to deal with the high costs of you being their client -︂ they also will file SARs more routinely because funds are coming from the high risk︃ merchant - but again that’s to cover their arse, but as you are legit (presumably)︄ these ultimately lead no where and are merely a formality of banking.