Stopped my self-employed activity

You need to ask support to transfer your profile to the new version of Dexter, where they offer a free read-only version. That way, you can continue to consult your data. For further details about ceasing your business, you will need to contact your business support centre. I will also send you a uRL from the government about this: https://economie.fgov.be/nl/themas/ondernemingen/uw-onderneming-stopzetten