If you are not going to invest the last savings in the crypto currency and are ready to buy bitcoin and altcoyins for the long term, then I would probably have acted as follows:
30% - bitcoin
30% - etherium
40% - on the most promising altcoyins.
Open the graphs of coins that are going to acquire, for several years, study, compare and then the picture will become more transparent.
As you know, everything is cyclical in our world.