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)
what? Verge is dead? I do not think so. It is only at this point that it has not fully realized its potential and it needs more time to get a market of its own.
At the moment, I still believe that Pundi X and Verge will have a brighter future in 2020 when bitcoin halving takes place.