Building Website Traffic

It's almost blasphemous... but I avoided all social media for years. No FB, LinkedIn, X, IG, Reddit, TikTok — thought it was a waste.
Built thelongmath.com: free financial calculators + transparent math (compound interest, fee drag, mortgage vs investing, TFSA scenarios, etc.). No opinions, no upsells, just the raw arithmetic.
Trust is easy. Traffic is hard.
Site is 3 months old. Doing SEO + helpful Reddit posts (sometimes 50 clicks, often 2).
What should I prioritize for steady traffic?
• More content + SEO
• Start YouTube (calculator walkthroughs + Shorts, $200/mo budget)
• Google Ads on calculator keywords
• Deeper community work
• Something else?
Honest advice welcome — especially from makers of free tools/calculators.
thelongmath.com