Iteratively designing and developing your product will ensure that the outcome much more successful. The chart here shows how the iterative design process works in the real world.
Further use of freehand, oblique, 1 point perspective, 2 point perspective, isometric, exploded view, sectional view and orthographic drawing techniques to communicate and explain the improvement of your ideas in different ways.
Use of paper, card, cardboard or foam to make a rough physical model of your design. This can then be used to test that the dimensions of your design are correct and gain user feedback.
Research into materials, manufacturing processes, components and finishes are all good ways to help develop your design technically.
Use of 2D design, TinkerCAD and Fusion 360 etc. can be used to create an accurate model of your design or part of your design digitally in 2d or 3d. This can then be used to create renders to test out different colour combinations or create files to send to the laser cutter, CNC router or 3D printer.