Run e-commence? Have a few of questions for you.

I've build custom carts, CRM's, ERP's automation and what not for e-commerce (actually e-tail hybrid) for the past 10 years.

What platform (Shopify, Big/Woo-Commerce, Magento, etc) do you use
On top of this, are you using some sort of CRM?
Do you manually go through your customer's list to find re-engagement opportunities? If you do, how much time do you spend?
If you can share - what is your volume (# of orders per month, dont need to share $ value) and how many different type of products do you sell

Really appreciate any and all answers :)