MetaQuotes-Demo account is used to update Metatrader to new build( mainly -- to the beta build) and to test beta builds of MT5.
And the trading account of the brokers (MetaQuotes is not a broker) should be used for any other cases/situation.
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Are you testing beta builds of MT5?
Not? So, why are you using MetaQuotes-Demo server?
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If you need especially this MetaQuotes-Demo account so you can open the other one.
But I am suggesting to you to open the demo account with the broker (especially if you are going to trade with this account).
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read this thread for more details:
https://www.mql5.com/en/forum/472993

How long does MT4 demo account last for?
- 2024.09.12
- PipSnager305
- www.mql5.com
Hello, I opened a MetaQuotes MT4 demo account back on 7-16-2024 and have been trading it very well but today 9-12-2024 I can no longer place trades...

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Dear MetaTrader 5 Support Team,
I am writing to request a password reset for my MetaTrader 5 trading account.
Unfortunately, I have forgotten the master password for my account, and I am currently unable to access it. Below are the details of my account for reference:
Could you kindly assist me with resetting the password or provide instructions on how I can proceed with this request? I would greatly appreciate your prompt assistance, as I am eager to regain access to my account.
If any further verification or information is required, please do not hesitate to let me know.
Thank you for your time and support. I look forward to your response.
Best regards,
Hassan Sultan
.