I change my username on Github and by this also on git page which takes also effect on Jekyll as it’s my GitHub page. But that makes all the previous comment and feedback disappear on my blog post (seems like). Is there any way to resolve? Thanks.
Disqus associates comments with the page’s URL. If that changes, which it has in your case, they’ll go missing.
I haven’t used Disqus in years but they used to have a way of changing the URLs. It might have involved exporting, changing the URLs in a .csv and then reimporting.
It looks like I can’t restore those feedback. Damn, I should know earlier. :(