Nope. Without quality backlink, you cant get top ranking. See after optimizing for On-page SEO you will get a certain ranking. After that, your off-page SEO will help to boost the ranking. So quality backlink is always important.

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I didn't get any info about Textterro. I can tell you one thing which is there are no website or software which can generate real content. To get quality content you have to hire any content writing agency.

If you want to change your domain from "your-domain.com" to "yourdomain.com" permanently, then you should use 301 redirections. Or, you can mark your website "yourdomain.com" as canonical of website "your-domain.com". These are prevalent and accessible techniques. You also can use 302 redirections, if you are not changing permanently.