Hello again, Skandha,
I figured it out. The problem came when I updated the Themify Builder. I restored my plugins from before this incident and the homepage slider returned. I’ve disabled all auto updates for plugins to avoid this in future.
Also, I went back to the Catch Base free theme, because the 1 year renewal price for the Pro version has gotten too expensive, in my opinion. It forced me change the featured slider setup (setting up new pages with featured images rather than just using the custom images option in Pro) but it works.
Thanks for your help.
Regards,
Eileen