Hello there,
The metric Domain Authority is calculated in total different way then the previous version, so you should not compare the previous DA with the current one, don't panic. You should interpret this as a relative metric to your competitors. So please check how the DA of your competitors is.
The DA also doesn't infect visibility and rankings in Google, it's only a relative metric. Our website https://www.denhollandsche.nl had a DA of 33 yesterday, we went to 25. Our competitors had a better DA in the previous DA and today we noticed they went further down than ours. This also happend at my other site https://www.buydrinks.nl
So as we expected, this feels as a way of justice for our hard work and the new DA seems to be more trustworthy.
Best regards
Simon Janssen