Here is a good source to decide which altcoin to invest in. I would never buy a dead altcoin with no development except Doge. Doge is unique and will be successful without much development.

Source:
https://twitter.com/el33th4xor/status/1068856384983363585?s=21dead alts are:
- Verge
- Holochain
- Bitcoin Private
- Pundi X
- Poet
- Decentraland (MANA)
It is quite sad how some projects goes from 'high' to 'low' amazes me and begs to question the mentality of members of cryptocurrency ecosystem. PundiX was among the biggest thing last year with their champion mantra of crypto adoption through bitcoin atm installations and so on such that Binance listed it. Why has the project suddenly become less active? Could it be the fault of the PundiX team or enthusiasts?