I get my 1min forex historical data from my broker hotforex.com.
You can register a demo account for free.
I normally download 1 million bars digits (after dot) historical data, but you can get more, it's just that prior to some date (I don't now this date), only 4 digit (aftter the dot) data is available.
The last one I downloaded is from 27 july 2017 to 4 april 2020 and all these are 5 digits.
I use Metatrader4 and you can download that also for free from there site. I did not try too hard, but could not download it from Metatrader5.