Add a second detuned VCO. Mix them together into a single stereo output and the patch goes from thin to enormous in one move.
One VCO is thin. Two VCOs, slightly detuned, sound huge.
We added a second VCO (VCO2) and a Mixer. VCO1's SAW is already going to Mixer channel 1. Patch VCO2 SAW into Mixer channel 2, and the mixer sums them both into the filter.
VCO2's Fine knob is unlocked. Turn it a few cents off zero and the two oscillators drift in and out of phase - that slow chorus sound is the hallmark of classic analog synth leads.