I have two sites now, and have been doing google seo working about 6 months before. One site appears on the 1st page of google search result of target keywords. Other site also appears on some keywords. Then, I worked same target keywords working about two sites. My sites does never appear together even one time on the 1st page of google search result. When the 1st site appears on the 1st page, 2nd site is on the 5~7th page, or otherwise happens. Why? I started two site almost same time and opened. 1st site was made by Wix, 2nd site was made by Wordpress. And the contents of them are not the same, absolutely unique, but target keywords are almost same. Backlinks have somewhat same parts, but I don't think this is the reason. Please tell me the reason why and how to deal this niche.