Apart from what @wortime mentioned, another reason why I would choose amazon is simply because of the trust factor that you have on Amazon. If it’s a new product/company, people will be more willing to buy it from Amazon than from a random website.
List it on Amazon, get a few close friends/relatives to buy it and then review it 5* (or you can buy fake reviews). That should get the ball rolling. Optimize your listing for all the closest keywords. Send traffic to Amazon from your insta and keep creating new, interesting content on what your product does.
Once you get sales, then you can think about selling from your own website. You might have to spend on all or some of the following: website theme/design, server, bandwidth, domain name, payment gateway, SSL, CDN, proxies for your fake accounts, software for automating accounts, etc etc.
I don’t know about where you live, but in my country, there are a lot of sellers on Amazon who help people like you who don’t want to pay the fee to sell. They sell the product for you and take a commission - that way, you pay only if you get sales. They might even handle the listing optimization, imagery, etc for you! You can sign a 3-4 month contract with them to explore how Amazon is working out for you and then take a decision down the line.
EDIT: Also have to mention that there are also a lot of low quality cheaters who offer the service above in my country. Don’t know how it is for you, but make sure to check their sellers ratings on Amazon and feedback to see if it’s all real or fake and whether you can trust them or not.
EDIT 2: Oh, and also, it would be good to create a one page website listing your product features and redirecting people to buy it on Amazon. You can use something like Wix to do it for free, or pay a small amount to remove Wix ads and connect a domain (you get this free with a premium plan). Make sure your product name on amazon exactly matches the title on your website. That way, in case someone finds the product on Amazon and googles it, they will at least find some info on it. And when you do decide to sell it on your own, you can just convert your Wix pan to an ecomm plan and start selling within less than 1-2 hours!
opinions would be great thank you