Hi Todd,
Thanks for the reply.
Yes, you may be right regarding bounce rate. Design changes could affect SEO rankings.
I don't remember exactly the complete changes I have made.
Actually I disabled the AMP module when that plugin was activated. I was not sure, since your label text said it supported another AMP plugin.
This is the current setup data from your Adsense theme support request.
Could you please tell me what modules to enable if I reactivate your RankMath plugin again.
But I think "history" feature of changes made to your site in Wordpress should be a new feature of Wordpress plugins.
We make lot of changes and we forget all of them in a week and we don't know what went wrong.
So I think too many changes in a short-period of time, is bad for SEO.
I will wait and see if my bounce rate and then the organic traffic is back to what it is like last Sunday(18th Nov, 2018) (from then onwards my bounce rate changed from 55% to 85% over a week).
If it doesn't than there should be another cause, since I re-activated the Yoast plugin.