Here is a good sourche 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)
If I have a lot of money I will invest on Pundi X that project was so very active. Their product already released and can be use now. That is amazing project I've seen. Try to buy some and you will know the result after few months. Good luck to all investors, Just saying guys.