in that case the best option he can do is always check the announcement of the project he is following and sell that tokens when they announce where it is listed.
you didn't say anything new.
such an option is currently used, it is probably quite hard to do it often manually, especially when you have 50 different tokens in a wallet. Plus many projects do not update their ANN regularly.
OP is obviously here in search of a simpler solution. Maybe to enable notification on tokens to default social media accounts, Twitter etc...