We changed our site from HTTP to HTTPS about a year ago.
We have a static website, with no functionality for user input, so did not see it as an imperative to change to HTTPS anytime sooner, the reason we changed, is that we used to gets lots of Google Analytics refer data a few years ago in Google Analytics, but noticed more and more of the traffic being listed as "direct" we presumed that this was because the sites that where referring traffic to us had also made the switch to HTTPS.
Since the change we have NOT seen a recovery of Google Analytics referral data going forward.
I wonder if this is due to any older backlinks to our website being to the HTTP version rather than than HTTPS version, even though we 301 between them.
Would that be the case, and if so is there anyway we could fix it to get more referral data ?