@Halo Welcome to the forum!
Have you read Deep blue sky effect? Read through the entire thread for tips and implementations. Note that I haven’t found the time to update my gmic script to have an option bring back the color of the sky.
Also, while RT has a steeper learning curve and has room for improvement, it is powerful enough to meet most needs. If you need more editing capabilities, move on to editors like GIMP after initial RT processing.
If you are new to RT, you may want to read Getting Started and Eek! My Raw Photo Looks Different than the Camera JPEG.