Yes their courses and certifications are very costly, and at the end even after completing you have to find the job by own.
So, the better way is start engaging in a growing community, share your work, review others work, and so on. By doing so, you would be able to see how the people are thinking.
I am a mentor, and running a free community, where we provide interviews details, job postings, and share useful resources related to data field. If you want to join, click the below link:
https://chat.whatsapp.com/B6weknl7133BQXjPva0pgB