I'm also thinking the same thing, I've seen the other halving and didn't do much after it but the next year was a boom.
It does also of course depend on what the wider economy is up to as well. 2021 is quite a way away and a lot could go tits up by then. All previous price action has happened with the luxury of a pretty much relentless rising tide. At some point that has to falter and then we'll see what's what.
We might be far away from that year but I think it's going to build a better economy by next year up to that year and the next would be part of another great history for bitcoin's rise and fall.
Perhaps, the price will hit $40k in 2021, but in 2020, the price will start to rise step by step, and it's not increasing in a short time. But who knows that what we expected can happen in the next year.
We have the same concept in our minds that gradually it shall rise by next year to 2021.