Not sure if any would reply who is one as this might not be allowed (their reply, not your post) but I will say I have seen and spoke with quite a few online instructor coaches/guru types and in my small sample size and with 6 years on Udemy most are not much "meat" regarding actual useful or personalized info, lots of buzz words, hype and promise, very expensive and I found zero helpful content from the (free) poking around I did, e-mail sign-ups and free one-on-one consults. They were all hype and no substance, that being said they were all sponsored social media posts no one I "knew" here.
There is so much valuable and Udemy-specific information here that I have received more help here and via people, I have met on this forum than anyone charging a few grand on some BS hype. Just my 2 cents- save your money and read and ask questions here! Udemy also has some great public articles!
I agree -- there's a TON of really useful information on this forum, and if you have a specific question that isn't already answered, then ask it!
Also, making Udemy courses is a learning process. Accept that your first 1-2 courses won't be stellar, and each subsequent course will be better. You can always go back and improve your older courses.