Implement a provider allowing the customers to create dynamic number of series.

Allow stacking of series one over another.

Check the attached project for a possible approach for working this around.

Implement Crosshair to show the mouse location(X,Y,Z Axis), depending on that where it is on the plot area.

This is the same as the Conversion API in the ChartView (2D).
https://docs.telerik.com/devtools/wpf/controls/radchartview/features/conversion

The API should allow you to provide 2D coordinates on the screen and return the associated coordinates on the chart axes.

Add a property that allows you to get the actual range of the LinearAxis3D when the Minimum and Maximum properties are not explicitly set. The same feature is introduced in the RadCartesianChart axes (like LinearAxis) via the ActualRange property.

as I implement SurfaceSeries3D, as well as many, for layered forms, such as provider series

Create a 3D range bar series. Something like the RangeBarSeries in the 2D chart.

Add lines series support in the new 3D Charts.
A Line series is pretty similar to PointSeries3D with a Line [a tube] that connects points.

This can be integrated in the Chart3DCameraBehavior. The user should be able to pan around the viewport. And also to zoom based on the mouse position. Currently, the zooming is based on the center of the viewport.

Add 3d chartview IsInverse axis options.