That's not really something to look forward to considering that the market isn't doing what people expect/hope it will do. It makes sense as well, because people are well prepared in that case and will unload their bags on the way up.

2017s bull run was so powerful because it popped up in our face out of nothing, and when people aren't prepared for it, they'll fuel the bull run by fomo'ing into the market at any price just to capture that exposure.

Important note here is that you don't have to wait for a bull run to profit. It's just as profitable to buy in low and sell 50-100% higher with a moderate leverage count. Waiting till 2020/2021 is just a waste of time and opportunities....