I dont know what makes TNB that special and why you hodl it. Just ask yourself a few question and you will see if you should sell your coins or not:
- Do you believe that there is a strong team behind TNB with a working product/real purpose why the token exists?
- Are there any major partnerships with well known companies?
- Do you believe that the price of the coin is in 5 years  higher than today?
- Did you invest more money into TNB than you are willing to lose?
If you really believe in the coin your answers to those questions should be clear.