Hello,
Thank you for contacting the support, and sorry for any inconvenience that might have been caused due to that.
Once you import your settings from Yoast, Rank Math will not delete any data from Yoast or make any changes to the whole website. Major SEO functions of Rank Math are almost the same as Yoast so other functions of your site will not be affected.
You can follow this video tutorial on how to properly install Rank Math with previously installed Yoast. https://youtu.be/dTvZuMRzW4w?t=220
If you are unsure, you can always make a backup of your site/database before migrating.
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.