With a $100 budget, I’d choose a low-competition niche that still has decent search demand and monetization potential. Getting visibility in a competitive niche with limited resources is difficult. I’d focus mainly on long-tail keywords, while using relevant social platforms to bring in early visitors. After the site starts gaining traction, I’d expand into more competitive topics.
I'd probably start with a less competitive niche, but I'd also look at its potential to make money. I think seo is a good long-term strategy because people are already searching for that kind of content. I'd try pinterest too, depending on the niche, but I'd rather focus on one or two channels first and see what brings actual traffic before spending more money
naturally, I will begin with a narrower niche where user look for some product that they can purchase. In other words, it will be foolish to spend my effort driving traffic which will not bring me any income. thus, I will start with SEO nd at the same time check pinterest if appropriate.
Yeah, with a $100 budget I would stick to one or two channels maximum. Choose a niche that you can beat in SERPs, write some good articles, and then use GSC data to see what should be improved.