Why did traffic drop after switching to https://?

Question

Google

About 2 months ago I switched to https://, a week later traffic from Google fell by 99%, and has not yet recovered, everything is much better with Yandex, traffic has fallen, but by 20-30%.
Why is this situation possible?
P.s. Redirects are set.

Answer 1

Was HOST registered in robots.txt to create a mirror?

Answer 2

it was necessary to first add a mirror, then change the main thing to https:// so that the ticks flow well. And in general ... it's not clear. Doesn't google webmaster show anything?

Answer 3

Crookedly crossed means.
Should recover over time. Mb 2-3 months wait.
In general, it was necessary to put https, add it as a separate site to the search console and webmaster, wait about a month for the PSs to glue the domains, put a redirect - lo and behold!

Answer 4

Something was broken during the transition. Now just wait for recovery. But everything will be restored