Ella Theme Customization Feedback

Hi Guys, I am new here, recently purchased the Ella theme and I found it very nice. Take a look at my store and please give your feedback on this and how can I improve it more?

Plus if someone knows about the MEGA MENU of this theme. I have read the documentation several times but could not do this as I am still learning stuff about this.

Let me know if someone can help?

link for the store is