Time during which steam prevents the sale of items unless I buy more games

I bought some games in Steam about 1 or 2 years ago. Recently I got some cards and items and I wanted to sell them. After all this time when pressing the sell button on such items. A message (translated) comes up saying:
A game is required to be bought, otherwise you will not be able to sell items anymore.
Something like that, At the time I was told by Steam that I had and estimated time of three moths left to do that. If that is the case how much time do I have until I'm required to buy something again to be able to sell items?
Best Answer
If you're asking how long you have to sell your items once your earn them, the answer is forever - you don't lose the right to sell things unless you become trade-banned for doing something like scamming.
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Why does Steam not let me buy anything?
One of the main reasons you cannot purchase games on the Steam Store is if the servers are down. You can verify this by using third-party sites like Downdetector, where you can view the current status of Steam's services.Does steam cart expire?
No, the saved cart will expire after exactly 72 hours. Steam Support cannot change the amount of time remaining. Your Purchase History page will show exactly how much time is remaining before the saved cart expires.How Do We Avoid The 15 Day Hold Of Items? (Steam Guard Mobile Authenticator App)
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