Am I on the right way ? any suggestion please ?

[Khaledmoalla]

Hi :

Now it's 3 month from starting seo my website by myself ( my website is like prchecker.info that give users one online service "

My both primary keywords have 450.000 and 100.000 **exact usa search , **when I start my goal is to rank my both keywords on second page during the first year , now and after 3 month after creating few quality backlinks ( guest posting and comments on relevant topic on forum ) my both keywords are ranked on 3rd and fifth page.

Any suggestion to create quality backlinks that might help me ?  should I continue with guest posting ?