Growth for Travel Based Business via Twitter and Forums

I recently started a travel based side business which I'm looking to grow. The audience for now is only for those interested in traveling to San Francisco and will include other cities in the future. Google Ads are in progress but currently seeing challenges getting CPL low enough to make it worth it. The next obvious step is SEO with a lot of articles on the "Top 10 Places for XYZ", "Top 10 Places to Avoid!", etc.

That being said I'm also looking at growth via Twitter and travel forums. The challenge I see with this is that the growth is linear. The product is one time use so it's unclear if it's worth my time spending hours on Twitter answering questions regarding things to do in San Francisco.

I'd love to be wrong here and increase my audience on Twitter but I'm not seeing how it would lead to exponential growth long term unless at some point you get to word of mouth. Would love to hear if this is a viable growth option and how it works.