As for me, I think you should invest in Ethereum most of all, because Ethereum 2.0 is expected to be released soon and price of Ethereum will rise, so I think at least 60-70 percent you should invest in Ethereum, and everything else already in Bitcoin and in Litecoin, since it is not known when Litecoin will begin to grow, but Bitcoin may rise in price this year as well.
The launch of Ethereum 2.0 does not guarantee us that the price of this coin will rise. We are not even sure that the launch will be successful, because the project team has been promising the launch of this update for a very long time, but nothing happens. I've already stopped believing in ETH.