Just like Avatar, the way of water is an experience, James Cameron is not selling story, actors or movie but an experience, visual treat to the eyes.
For the people confusing the plot shift in Avatar 2, humans are still extracting minerals and making pandora ready to colonize, but in this part they covered other side as they didn't wanted to stick to previous story line. Moreover James has already shot some scenes for Avatar 3 & 4, so don't worry, they have lot to show.
And if you think Avatar 2 was slow, please go and watch Avatar 1. You will understand these initial movies are build up.
Note: Avatar 2 & Maverick are the best movies of 2022.