Note: I have a couple hundred thousands ESP in my bag

It all depends on what investment do you prefer - trading? short term? long term (1y+)? Espers has some interesting applications according to the whitepaper - it is not only about messages on chain and websites on chain (which is itself very interesting). It is like a Substratum with much more to offer - Espers may serve as a "glue" between blockchains. Current blockchain world is very fragmented and ESP has some technology to solve at least a part of this. But it will be a long run - if you like to risk, keep your ESP and you may be rewarded in a long term horizon. Or not .. you know, crypto is risky.