What are you trying to do?

In general, marketing is not a thing that you can do alone. There are, I think, four primary facets:

1. Making sure that your web presence is optimized for search, AI, etc. This is not easy and best practices are constantly evolving. Just hire RankScience or a similar firm and learn from them. Mistakes here can be extremely costly, so you'll want to make sure you're properly set up.

2. Getting good press, interviews, etc. You'll want to learn how to write a press release (there's a proper format) and have them placed. You'll also want to do outreach to publications and venues that you think are favorable or a good fit. Either buy a subscription and use Opus 4.5 for planning and editing and Kimi-K2 for writing -- or just hire a firm to take care of it and learn from them. This is less expensive than you think. (My firm pays something like $500/month for PR services.)

3. Social media and Youtube. You may not need this, and in any case should not pay for social media services. (Always unreasonably expensive, sometimes sleazy.) Just do your own thing, post cool videos if you've got 'em, comment on other people's stuff, and answer questions. Do not use Reddit. I've never seen a company use Reddit and not live to regret it.

4. Advertising. Again, you may not need this. Modern web advertising can get very expensive, very quickly -- it's practically designed to spin out of control. My recommendation would be to figure out the prior items before considering any campaigns.