This is a great post Yaro. I like the progression you take us through on which things you tried first and eventually evolved into doing now. I know for me #8 and #9 work best for me to achieve passive income online. I started with eBay also and like you said I think it is a great way for beginners to learn SEO, sales copy, customer service, handling transactions etc. This will prep you for selling your own physical or digital products on your own site. Do you think you will hit the mobile space?
I stopped using this method once I started my own card game site (more on this below), however I still believe niche collectables, particularly in a market that you really love, is a fantastic starting point to gain experience making money online. Like eBay you can make money selling secondhand items in community sites if you can find a way to source product at cost or below. It’s not a model that has much margin so again the challenge is to scale if you want to make significant profit.
Using a food delivery service can’t necessarily earn you money, but it can help you save you money if you constantly find yourself throwing out half the food you buy. Food delivery services send a box of food every week with new, sometimes unique vegetables, meat, fruit, and so on. If you don’t have time to shop and want simple meal-prep that leads to a good meal, a food subscription service may be perfect for you.