A good question to ask since lots of recommendation will be posted, but could you able to do those suggestions given?. There are lot of ways to earn bitcoin if you search it online, but its hard to apply those earning methods they say since knowledge about on what you are doing is important. Because if you learn many things about crypto then next to that is earning phase. Although its not really so easy as you think since you need to be good first before you can achieve those earnings goal you wanted.

Maybe you should also check if you target the right audiences when you selling your product. Since maybe there's something wrong the way you promote. If you post it on people which have low interest on your product then expect that no sales will be created with your post. But if you study your market and check those people that might possibly buy your product and do good marketing maybe with this you can successfully have a sales.