I'm going to guess from other posts that you're a resident of the UK and have a British passport, you have holdings worth EUR 1m+ and you want to spend some of your
crypto on home improvements etc. Now you want to
cash out £50-£100k without making an enemy of the banks or HMRC. You have not traded with your main holdings which you've had since 2015.
If the original source of funds was clean and you're willing to pay some tax then a well respected local tax accountant can help you with the
Self Assessment form and answer any enquiries from HMRC or your bank if needed. A well established accountant asks you all the awkward questions up front, so later if there are difficult questions they should be able to answer with confidence. If your accountant has been practicing for a long time in a boring and safe way, their replies to authorities should be treated without too much suspicion.
You'll be due some
capital gains tax on the profits on the crypto that you sell. So if you bought X crypto for £10k and now it's worth £1000k and you want to sell £50k then you pay CGT on £50k*(*1000k-50k)/1000k)=£47k5. This is a maximum of £7,540 even if you declare lots of taxable income and used up your allowances already. Well under 1% of your wealth goes to taxes, to keep things above board. Of course you need a crypto friendly
bank account, some intermediary or an OTC dealer as not all UK banks like getting unexpected £100k payments from
crypto exchanges.
A business paying you salary will probably cost more in taxes, fees and hassle.
If the original source of funds was dodgy then it probably is easier to relocate - else spend a lot of nights lying awake and hoping that tomorrow isn't they day you get caught running some complex scheme.
Also if you want to cash in tax free then you can relocate. You didn't cause taxable events in the last few years and the UK doesn't have exit taxes (apart from some immovable property) or citizen taxes...yet. UAE or maybe Georgia, Portugal or
Germany. I suspect you know the list already.