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Tap the link in my bio to start the drawing drills course. A cube is one of the best forms for practicing intuitive perspective because every change you make has to make sense in 3D space. Start with the basic box, then modify it. Push a corner inward. Pull another one out. Cut into a side. Extend a plane. Change the silhouette while keeping track of where every surface is facing. Each modification forces you to imagine the form turning and changing in space without relying on perspective grids or vanishing points. Do it enough and perspective starts becoming something you can feel instead of constantly calculate. Learn the cube. Then learn how to break it.