As you know, it is very difficult to find a true risky free SEO these days. With my knowledge in SEO as a former SEO THAT WORKS student:
I will audit your website and then backlink it using high quality backlinks. It will be a mixture of all kind of backlinks available online. No porn, gamble or spammy links. It will be 100% clean and safe. Up to 2000 quality backlinks. Expect Google high rank in two weeks.