The key is to see what kind of capacitor you are making. If it is aluminum electrolytic capacitors, then go to the circuit board companies, or small appliances and so on.
If tantalum electrolytic, go to the military industrial enterprises. If it is a small plastic shell, then look for the appliance industry. If compensation capacitors, then look for switchboard companies and substations. High-end are specialized production, you can not do that market.