Why my competitors are still in front?

First of all check your On-Site Optimization.
Use your keyword on your page.
Ping all of your backlinks by using Bulkping tools
Hope so it will work for you.

Did you create all backlinks on .com.br sites?

Take the time to learn the basics of SEO mate. Quality over quantity when it comes to links. Although preferably both.

You also have to take into consideration the quality of the backlinks you have. It does not help you as much to have 11K in backlinks if they are all low quality. You have to have high quality backlinks as well.

Benjamin Ehinger

You should focus on getting high quality, dofollow anchor text links, varying your anchor text only by 10%.

Remember that back links alone will not sustain a ranking. as others have mentioned check out your on-site content. In the struggle to the top we sometimes forget to check our basics.

Ultimately the sites outranking you may be defeating you by the net-vote (how long people spend on each site, how often people returned to those sites and other factors that Google measures to determine how much users like you site).

if that is the case you need to increase your net-vote by having content that will keep people on your site longer and coming back on a regular basis. We have been watching Google for 8 maybe 9 years on this factor and we are convinced that back links get you noticed and pushed to the top but the ultimate deciding factor of your rank is determined by your site's performance( the net vote ).

after many studies it is our conclusion that you can easily make it to the first page of any two word search term with just a few relevant inbound links. However, your ability to sustain your position is determined by your site performance with end-users.

The best way to get a look at this is by looking at your bounce rate. The bounce rate is a direct indication of if people like your site or not. You need that bounce rate low relative to your competitors.

So check out their sites as I am sure you have: but this time look for why people might be spending more time at those sites rather than yours. videos, extensive picture galleries, games.. Anything that keeps them on their site longer than yours. I assure you this is the key to out ranking them.

if you are in close proximity to them be careful about more back links. You could end up with a link devaluation if you force the issue with back links and do not have sufficient internal site performance.

Domain age and onsite SEO are huge. You haven't talked about either.

Your competitor kitsart has an xml sitemap. My Seoquake plugin says your site does not have one. Get a sitemap up on your site (there is a plugin if you are using wordpress) and ping it to Google.

Have you done onpage for your website bcoz its gives more boost

The mistake you are making here is you are focusing on backlinks which is ONLY one of the criteria google uses for PR. Explore other possibilities, watch your competitors closely and see what makes the difference.

On page optimiztion is very important for all website to getting high page rank in search engines.

I had the same issue and once I really paid attention to my ON page SEO, I moved ahead rather quickly. I pulled out every on page SEO trick I could find.
sometimes google doesn't seem logical but it is! you have over looked something....now you just have to figure it out.