Did I make a mistake by using coinjoin all those years ago?

So many years ago I purchased a certain amount of Bitcoin. I've put the BTC on a wallet, I believe it was Wasabi, and used the coinjoin feature. I've been learning about Bitcoin and it seemed like a good idea at the time.
I continued to accumulate Bitcoin but only did the coinjoining with the initial BTC I purchased.

So fast forward to a few months ago. I wanted to take some profits and put my BTC on an exchange. Almost immediately I get this message:

Your account has been closed. Below we explain why.

According to European legislation, we are required to have sufficient knowledge of our users, their accounts, and the transactions linked to those accounts. We must assess the risks that a user may pose. If the risks turn out to be too great, we are obliged to take measures to mitigate these risks.

From a risk perspective, we have decided that it is not possible to continue offering you an account because the amount and frequency of your transaction(s) to or from mixing services pose an unacceptable risk.

We understand that this is inconvenient for you and we apologize for the inconvenience.

We trust that this has provided you with sufficient information.

Did I make a big mistake by using coinjoin all those years ago? Will I ever be able to use my BTC as collateral or put it on another exchange?