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's a good source that will surely help those investors who have problem in choosing the right project to invest in. Dead projects should be buried so other investors will not fall victim to them.
I am not a fan with Doge but as I see, it is currently ranking in number 28 base on coinmarketcap so it is still a good choice if you like to invest to it. But I prefer investing in top 5 only in coinmarketcap so I can lessen the risk of my investment especially that the market right now is nearly at the bottom.