it depends which altcoins we're talking about, the scam ones will never see bottom, it will see nothing and your investment go to zero. that's the bottom.
It is never easy to separate scam from the good ones. If they are not scams then they are non-starter and non-monetizable like Ark, Lisk, Bitshares or the plenty of others that have a history on this forum but never really made it big. The fundamental question always remains that what exactly do alts have to offer when there is BTC and ETH for every possible blockchain use-case there can be.
Some alts died long time ago (years ago) and never recovered from there.
When we talk about alts, nothing is certain. (actually nothing is certain for any crypto out there) They may recover when you least expect and can even make new ATH's.
LOL. Tell us which one of YOUR alts died. I mean we all should be a bit candid sometimes and talk about our own shitty or crazy experiences with Alts. Nobody ever talks about them. I ask this because this particular post of yours seem to come from a place of having been through the roller-coaster of hoping that maybe ONE of your alts will moon like you thought..