I have got several courses that I recommend, the 3D Environments Course by Rob Tuytel is excellent, I am currently working through it (https://www.udemy.com/course/blender-environments/). You can check out my profile if you want to see some of my renders from it.
The Cinematic Motorcycle Race Animation course is also good (https://www.udemy.com/course/motorcycle-race/).
The instructors of both of the courses respond quickly and are happy to help solve any issues.
I have a post in a different thread that has a list of my favourite Blender resource, you can find that here (The best Blender resources - #3 by Withers99) you can also find my full feedback on both courses there.
I would also recommend looking on Udemy and seeing what looks good, you can read reviews and find out what you want. What skills in particular do you want to imrpove?