Do you keep holding it hoping that the price will finally come up since it seems you can't actually trade it with it current value.
Will the altcoin become valueless after the campaign is over or could still gain value after some years.
Nothing to do if the token accumulated got low value since for sure we cannot trade that since the volume would surely if not zero it goes less since the dev already drained all the volume since usually what happen there is they scam those people believing their project.
I also don't hope for any future pump for such type of tokens since there's nothing to comeback for scam devs just ride up with past bull run that's why to avoid getting stress with that much better if you just forget about those token and make it as part of design on your wallet.
Although maybe there are other altcoin would pump but this is rare phenomenon on altcoin especially if they don't have huge volume left.