-As long as you cannot sell your tokens at a certain price, that price is not real. When there is no buyer, your tokens value is almost zero.
-If you have a token that has not listed on any exchange yet, there are two scenarios. 1. You have been scammed. 2. The team is trying to list the tokens on an exchange and it will happen in future. In this cannot talk about the price before it is listed.
It is true, if you can't sell at specific price, then your tokens are worthless.
If there are sell orders only and no more buy order for that token, that token is dying.
No trading volume means no traders are interested anymore for that particular token.
If you can find an exchange with buy order, sell it as fast as you can and move on.
Because sooner or later, that token will be of no value in the market.