In 2021 for sure, Im not certain of that in 2020 but would love to be wrong.
My feeling as well ... the increase in 2020 is probably modest, but I expect / hope that we reach a new ATH in 2021 or 2022.
Main reason; the cycles are getting more spread out, and the halving is probably more anticipated now than the last time (more energy efficient miners, and so on). So I don't expect any fireworks starting before Q3 / Q4 2020.
I'd love to be wrong as well though, of course!
There is as yet no evidence that the cycle is lengthening. Any real mooning in 2020 would be (if anything) a tad early as four years from 2017 would mean 2021.
This year's halving will be almost seven weeks earlier than in 2016 which may have some effect, but I doubt a massive one, cycle-wise. After the last halving the price spent months doing little until towards the end of 2016, and it didn't break the ATH until into early 2017. It ended 2016 only a little over twice the price it was at the start of that year.
If a four year cycle is intact, the price was ahead of itself in the middle of last year, but it is now back roughly in line with a repeat of 2015 / 2016. The model (if it were to exactly repeat) would see a spike around the halving and then a dip... then a spike up (but not ATH) around November December this year (2020). The seven weeks earlier may affect things with that timeline and pull an ATH into this year - but in any case we already veered off it once quite massively, so what honey badger will do is obviously far from predictable with any certainty.
A lengthening cycle is neither proven nor disproven, yet. That said, so far it's more likely IMHO that if we are to have another 'mooning' it will be late in 2021 - with the ATH broken possibly in late 2020, but more likely early 2021.
Just my thoughts at the start of this halving year. My gut instinct says:
Trust Satoshi's design, be patient, but stay strapped in.