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.