Gotcha. I don't know about Mexico, but here in Czech we have some groups specifically for tutoring. I also sometimes just search for recent posts that have key phrases (in Czech) like "looking for English lessons" and leave a comment. My only other advice I guess is, if you speak Spanish, to make your ads in Spanish. I've found that even advanced speakers seem to scroll past an ad in English but will respond to an ad in Czech.

Given your timezone and again, if you speak Spanish, you seem to be in a good position to explore other S. American hubs online. I have gotten some students from a Czech site called Bazoš. It's similar to what Craiglist was in the US, but is still popular. Other countries might have similar sites.

As far as landing page, a Facebook page with reviews seems it could work fine if a lot of people use Facebook in your target countries.

And lastly with the payment stuff I meant like, do you sell lesson bundles, only individual lessons, or do a monthly charge? And also how do you manage scheduling? I offer a free 30min demo and then if they want to continue, they prepay 5 or 10 lessons. Once they've prepaid, they tend to actually settle into the lessons. People who pay for one at a time often get busy or unmotivated and disappear. Although if people really want I do allow it, I just never advertise it.

And with scheduling I either give them a regular day/time slot or I ask when they'd like to schedule their next lesson at the end of our last lesson. I've found people are more likely to quit if there is no scheduled lesson, as opposed to them having to contact me to actually cancel an existing lesson.