That’s not good SEO, there should be a mata description tag. There’s not one at all in the template, nor an option to add the various meta tags. You promote those as “Code built with SEO best practice in mind”. If you can’t easily modify the meta description and page titles then this claim is untrue.
If you can update the theme to include these options I’m sure those of us that purchased the theme would be very appreciative. Thanks.
Your background image is now 1.5mb! That’s way too big for a background image, and certainly one of that style. Use a JPG not a PNG, and you should be able to compress that to less than 50kb easily.
And a little tip for your site: You also need to fix up your background image, it cuts off at the left if you have a monitor that is 1600px wider or wider. You should have either a repeatable background, or one that fades to a solid colour that you can then make the background colour (eg. black).