I think this 4 years cicle looks similar as the bullrun in 2013/2014.
My prediction is we will see a temporary top in mid 2021 at around 90k. Alts will probably go parabolic at this time. After we hit the 90k ish mark, we drop back to 45-50k area, where we will find our new bottom in the end of 2021.
At the start of 2022 we will go bullish again and we will see the top of this bull cycle around 200-250k. After that we end up in a new bearmarket, what will last for 1,5 years. Bottom will find again in the 45-50k area. Then we can see a
new start of a 4 years cycle. Next halving is around march 2024 and we hopefully see another great bullrun!