I would say that the whole crypto market is so huge that there always will be an opportunity waiting for your investment, but finding it is not as easy as it looks. Of course your chances for a succesful investment (by that i mean, you earn money of course ;d) increasing when the market is weak. Choice is yours, there is plenty of chances.
I would choose those which developers are really active and they're still updating their coin. I believe this is a good sign when crypto developers actually communicate with crypto owners and they listen to their opinions. Sometimes such strategy could bring us some very important changes and new possibilities - for example, newly updated FuturoCoin masternode system gives their users chance to generate passive incomes.
And this is an example of an investment you can make. According to their website and
https://newsroom.futurocoin.com, and articles on their medium it looks like they've finally restructured they masternodes system, and set the price for 1000 fto. Recent price drop is giving an opportunity to get your own masternode, and like you said - generate some more likely passive income.