Q1. Fact is the release of those tokens will make the value of the token go down "
A1. Token release is not strictly meant to be a dump although in most cases there will be a dump after token release. I have experience with an altcoin called Oasis Network (ROSE), at that time I had a few bags of $ROSE, then I heard that they would release a token in the next 1 month, I immediately sold my token to avoid the dump price impact of the release. But what happened after? I was disappointed because it wasn't a dump that happened to the token but a fairly large pump. It turned out that they had a different agenda regarding the token release, they released tokens for the development of their ecosystem such as creating a Hackathon, of course this was what made the price of $ROSE at that time a pump.
I mean, apart from when the token release will be, you also have to know for which allocation the token release will go, if it will go to the good side like for project development, instead of selling to avoid dump you should hold your tokens.