I would suggest that you contact the managers at the places you have applied in the past and ask them if they received your application. Find out if they would be willing to spare you a few minutes and discuss with you their reasons for not hiring you and if they have any suggestions on what you could do to become hireable with them. It would be better if you could met them in person to have this conversation.
It could be you do not have enough experience for the positions you have applied for, or it could be your resume does not reflect your skills. Usually if you look good on paper, you have a great chance at being called in for an interview.
I would strongly suggest that you apply for any retail positions in person to the manager, rather than leaving, or sending in your application. I was in management in retail for many years and I think you can represent youself better face to face. Often you may get an interview on the spot. Also, apply at the companies you would like to work, after researching them first. Don't wait for them to advertise a position. You might be surprised at how successful you will be.
Many web sites benefit from a network effect. One example is web marketplaces and exchanges. For example, eBay would not be a particularly useful site if auctions were not competitive. However, as the number of users grows on eBay, auctions grow more competitive, pushing up the prices of bids on items. This makes it more worthwhile to sell on eBay and brings more sellers onto eBay, which drives prices down again as this increases supply, while bringing more people onto eBay because there are more things being sold that people want. Essentially, as the number of users of eBay grows, prices fall and supply increases, and more and more people find the site to be useful.
If yes, you don't have to deliberately tweak your carb intake. When you start taking coconut oil, it will automatically help you "determine" how much carb you have to take to fulfill your daily requirement. All you need to do is just listen closely to your body needs. People tend to take in more calories than they need when they ignore the signals that their body gives. For example, when you see your favorite food, you would just go for it without "asking" your body whether it is hungry and does really need to take it now or not. This is when people start to gain weight.