Just notify the authorities holding your trust that you need to make an amendment. The only one you are not allowed to close is an irrevocable trust no matter what.
This is not very hard to do. Just notify the authorities holding your trust that you need to make an amendment and that should do it. The only one you are not allowed to close is an irrecovable trust no matter the reason.
The most simple way would be to remove all of the assets from the trust and by closing any accounts associated with the trust. If the trust has no assets it does not exist.