So in order to extract from the wallet I need to sell the coins even though there is a large value on it? I cant just withdrawn it into a bank account? Seems very unusual and rather complicated.
Think on the coins like they would be gold, or shares or something like that. Banks don't accept (yet?) that directly.
It's even worse, some banks don't like to receive money from exchanges and may make you headaches.
Some directions I advise:
* Exchange smaller amounts at a time and see how it goes. There are decentralized exchanges, there are centralized exchanges (but they need KYC), there is even the in-person option or bitcoin ATMs (although the last have rather big fees).
* Something people didn't advise on this topic, but imho it's a direction worth thinking about are crypto cards. Many are available in UK. You need to provide KYC and stay legal, but you'll get a Visa or Mastercard you send crypto (top up) now and then and spend with the normal expenses or withdraw at ATM. There are many providers, different fees, you'll have to choose one that fits
you better.