Advanced Course Recomendations?

Hello everyone! I recently launched a website for my business and have been getting into SEO. I feel like i have the basics down but want to start learning the more advanced tactics and strategies. I am in a high competition industry so will need to use every strategy I can find. Alot of the courses I'm seeing are more beginner focused but I'm looking for something that's more advanced. Do you have any recomendations? Happy to spend some money on it as long as it's worthwhile.