Multi-vendor marketplaces, like ThemeForest, can be very successful. Chose a niche and create a vendor website for it. Your marketplace could be anything, from a platform for local artists to sell their work on, to an online digital product store. Once set up, invite people in that industry to sell their products on your site. You take a percentage of their profits when items sell.
- A training course could be a good idea to target newbies - could be an ebook, video course (or both) or simply a series of emails - this will get them on your list and then in the training course you will have affiliate links to the robots/platforms etc or other products that will make their job of trading easier/make them money easier/faster etc - they are also then on your list for future communication and marketing.