Start with one clear niche, then build a small set of useful pages around real questions people are already searching for. Basic SEO still matters: clean page titles, search-focused articles, internal links, fast loading speed, and making sure Google can actually crawl/index the site.
At the same time, don’t wait for SEO only. Share helpful answers in communities where your target users already hang out, but avoid dropping links too aggressively. If the content is useful, people will naturally check your profile or site.