I need to find the most efficient and preferably versatile tools with lots of features for dropshipping automation. Can you recommend any from your experience? I work with marketplaces such as Amazon and eBay.

I've heard that many people who sell directly from Amazon and eBay in their online stores use Easync's automated dropshipping tools. This helps them solve a lot of business issues, including complex ones like finding and analyzing actual products and so on. You can read more about this tool here https://easync.io/.