I wish I had that problem!! My account is only a few thousand. I doubt that I will have a problem. But 50k could be a problem if you use an unregulated broker. Maybe try and take it out in stages a few thousand at a time
If you are using a FCA regulated or the equivalent in your own jurisdiction you can withdraw over £100k a time, the only thing that may restrict you is your own bank, who may have some questions to ask you before releasing the funds.
We use FxPro and we are very happy with their cooperation. They respond very fast and always willing to help. We had no questions about the withdraw that was executed at the same day with our request!!
Most people don't want to make their accounts public. Would you want to publish your bank account details to the world for inspection. Don't expect others to allow their trading accounts to be seem publically. Many trader also are scarred of their strategy being stolen