My guess is if Bitcoin and cryptocurrencies ever see another bull run again like we did in 2017 that it will be between 2021 to 2025, it depends on the adoption rate, public interest and how strict regulations are by that time period. A lot of people are still in heavy denial that 2017 was a massive bubble and is still in the deflation process. Bitcoin will not be going back to $20k anytime soon if ever. Everyone needs to realize that there was a massive mania in November and December, interest in bitcoin has heavily declined since then as a lot of people lost a lot of money. The mania is over, and now a bear market is imminent for the foreseen future. Right now there is no use for bitcoin or any other cryptos, until they have actual real world use, the price will not return to aths. Everything right now has been speculative hype.