1) a) First of all I would not recommend you to install all the plugins that you could install from the XStore > Plugin installer just in case. Install and keep enabled only those plugins that you really plan to use. For example, if you don’t plan to sell products from the Amazon then there is no need to keep WooZone plugin enabled. If you don’t plan to use functionality of the WooCommerce Dynamic Pricing & Discounts plugin https://codecanyon.net/item/woocommerce-dynamic-pricing-discounts/7119279 or HubSpot All-In-One Marketing – Forms, Popups, Live Chat then there is no need to keep these plugins enabled. Every additional plugin slows down the site because calls additional styles, scripts and makes additional requests.
b) Why did you install 2 page builders at the same time? Page builders are heavy plugins and we would recommend you to choose one of them (Elementor for example) and disable WPBakery plugin.
2) We always face the following error on your site while navigating between backend sections https://prnt.sc/1vz5yai and a lot of 520 errors in console https://prnt.sc/1vz6wci Contact your hosting provider and ask them to check the error logs and fix the errors related to server settings to solve the issue. Because we can’t check theme options because of this error. Reply back once you fix that.
5) Contact Dokan plugin support here https://wordpress.org/support/plugin/dokan-lite/
6) WooCommerce does not have a lot of options to customize the registration form. Read this post https://quadlayers.com/customize-woocommerce-registration-form/
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.