You seem to be very focused on blog posts both in your post in and your reply, as if the only options are blogging and paying TikTok influencers, and there's nothing in between -- but there are tons of options for content that aren't blogging. Blogging was never a very good marketing strategy, even back when blogs were still popular and the SEO was still easy.

And I still think you're putting way too much emphasis on virality as a marketing strategy. Product placements are almost universally NOT the Toks that go massively viral, and even when they do, it's not as big of a payoff as you're hoping. One million views will result in 100-300 people actually trying the app, and at least half of those users will drop off within a matter of days. So, your entire strategy is to pay other people lots of money in hopes of an extremely rare event that gives a marginal bump in users (if you're lucky).

Even traditional paid advertising is far, far more effective than that, and you'd only be paying ~$2 per customer acquisition.