I did not know that most pilots exchanged their UK EASA to an EASA member state,
No they didn't, unless they had a particular reason such as professional pilots flying for a EU based airline. For the majority of PPL holders it is irrelevant.
I have found out I have lost the privileges of my UK EASA
No you haven't. The letters EASA should now be disregarded but your licence retains all its privileges and is also recognized world wide, nothing has changed in this regard. You no longer have the automatic right to fly aircraft registered to an EASA state without process. This is the same for most countries throughout the world. If you have the need to fly an aeroplane registered in a EASA state then it affects you but not otherwise.