I have checked and you want something like https://www.awesomescreenshot.com/video/756755?key=59adbbf22f74a0c7e3bfb85f739a3be2 , as you can see in the video when the quantity increases above 3 the automatic discount is applied Can you please here what you mean by term "multiple " in multiple automatic discounts by this you mean id the cart or product is eligible for multiple discounts than it is should be also applied?
Kindly share your full requirements with me at Sandeepsingh.firstname.lastname@example.org I will be happy to help you.
You can try this one for an automatic discount on your sales pages. - https://apps.shopify.com/automatic-discount-rules
But In my opinion, you can try some gamified discount popup. It converts a lot. You can try this one - https://apps.shopify.com/tada-pop-ups-game-emails I am using it. You can use far longer with the free package. It's a gamified email popup app that asks the shopper to play a game to ‘win’ bigger discounts. Tada’s engaging pop-ups will allow you to collect more email addresses.