If your current airplane has steam gauges, get some time in the glass cockpit. You should be able to take an Instrument Rating ride in either type of cockpit, when the time comes.
I don't know where you are, but time in a complex airplane (retractable gear, controllable prop, and flaps) may be needed for the Commercial rating.
Time in gliders and tailwheel airplanes will make you a MUCH better pilot.