I think we should buy Bitcoin first. Institutional investments in Bitcoin continue and I think it will continue until 70000 dollars. At the same time i can recommend Litecoin, Bitcoin Cash and Waves.
Bitcoin stable growth and it is very good for the whole cryptocurrency market.
For altcoins it is very important that they will be useful for people and will be in demand. In such case they will have value in future.
Now appear projects that help to protect the planet from pollution. Here is information
https://moss.earth/blogWith every year the demand in the protection of the earth against pollution will only grow.