To continue, or shall I move on?

Hey, just a question for everyone out there, I have been at this for about 7 months and have only had about 4 organic search results, a ton of spam bots attacking my site and my analytics and about 2 sales (from social media).

I have given up on social media and am focusing on trying to get my blog recognised by Google, some of my keywords rank as high as #4 and some are on the last page, I have 63, high quality posts, ranging from nearly 2,000 words to 500 words.

I have changed my writing style a little from the beginning to now as I have evolved and have updated a few older posts to fit in with the keywords and how they should be also.

You can check out my site here, http://www.freedomweightloss.net

After talking with a few very successful people in the industry, I was told that the fitness and weight loss niche is super hard to crack and perhaps I should try another one.

What is everyones thoughts on this? I am really at the point of standing still, where I don't want to waste time on a site that isn't going to rank or make sales in an industry that is too hard to crack, but I also don't want to abandon all the hard work I've done and start a new website unless I know that that direction will work.

There are 2 options here, either it's me that's the problem or my website. Take a look and answer this question for me, positive criitcism expected and welcome.