Let's see the historical data: - First halving, on November 2012 : Bitcoin increased from $11 to $1,100 in 2013 (one year later)
- Second halving, on July 2016 : Bitcoin increased from $600 to $20,000 in 2017 (one year later)
- Third halving, on May 2020 : Bitcoin increased from $6,000-$8,000 to
$??? in 2021 (one year later)
Based on historical data, the maximum rate of BTC in 2021 (not in 2020) should be more than $20,000 (ATH in the second halving).
However, there is no guarantee, mate.
BTC price/rate prediction: 
*
Halving data got from:
hackernoon.com*
Chart picture got from:
cryptocointrade.com If the price of bitcoin rose well in previous years, this does not mean at all that it will also grow in the future. Therefore, to forecast its price, analysis of previous growth is not significant. Bitcoin will rise and fall in price more than once. And about any specific amounts can hardly be argued with a high degree of probability.