I am trying to guess what will be the top 3 coins in 2 more year, say on 1st June, 2020.
Probably, BTC may not be the champion anymore but will still stand at runner-up position thanks to its historical role. ETH providing reliable platform for many valuable tokens can overthrow BTC to become the king. One of the coins with 3rd-generation blockchain like ADA or EOS will deserve the 3rd.
Anything can happen, and that's my prediction. What's yours?
here's the thing, all alts will depend on the father of altcoins which is BTC, in terms of ROI, maybe BTC can't compete with the low cap alts but the certainty of liquidity and future goes to bitcoin. Bitcoin should you invest first as the bitcoin caries less risk than the low cap altcoins. But its up to you what you choose as long as you knew what you're doing.