Dropshipping certainly has it advantages, but margin isn't one of them
E-commerce is a risk = "potential" reward business. By that I mean, the more someone risks, the greater the potential reward is. For example, a buyer outlays $10,000 on a wholesale load, then that is a risk. So to counter that risk and encourage the buyer to spend the money, the wholesaler gives a discounted per unit price that now allows the buyer a competitive price to sell at with good margin remaining.
Dropship offers low to no risk because there is low to now up front costs, so in return there isn't the margin you are looking for built into the dropshipped products.
This is a really tough road, especially if you're not in a position to be marketing your own website because now you don't just have the low margin impacting on you, you are in the middle of a very tough ball game.
Compeitition - and I mean just the compeition you face from thousands of other sellers frol all over the world all trying to sell the same products to the same customers as you. Now that's just dropship competition, but on top of that you also have those wholesale sellers who have spent the big dollars and have secured prices that a dropshipper can only dream of seeing.
So now you're not only competiing against other dropshippers, where you are at least on a level playing field, but now you are competing against wholesale sellers who have a massive price advantage over you. 9 times out of 10, a wholesale seller is going to be able to sell cheaper than wht you can even buy the product for, let alone try to sell it for and that all comes back to the greater risk they have taken in outlaying so much cash upfront.
If you are going to make money from dropshipping, you really have a few options how I see it.
Marketing your own website to keep your competition down, if you don't have the ability to do that, then you have to look at either smashing out your listings or dewaling in a slow market where the big sellers aren't playing due to nthe slow turnover.
Smashing the listings, sites like eBay offer great traffic flow, so common sense dictates that you have more chances of making sales on a platform like that, but here is the downside. With listing fees, you are running a risk by running with massive uploads of products. It's a startegy that has potential to work, but can easily fail with you losing money on all your listing fees.
A lower risk is to chose free listing sites and smash out your listings there. Sure, traffic is going to be much less, so that will uausally translate into slow sales in the best case scenario, but all you have to lose by smashing listings out on sites like this is the time it takes you to do it, you aren't risking losing cash on listing fees.
You're other option, use the big sites like eBay to chase the slow markets, the markets where products sell slower and the big sellers are ignoring while they chase bigger fish. Here is where dropshipping can really shine in my opnion, especially if you can get into consumable markets. If you get into a consumable market, then it gives you a chance to build customer relationships that encourge repeate business and if you can develop a few of those markets and the repeate business that can flow from them, then slow sales aren't that much of a factor.