Just keep selling options and growing cash balance. What can I do to be more efficient?

So I made some good/lucky trades and now have a large amount of cash in my account. I mostly just sell OTM CSPs and put/call credit spreads, using the cash for buying power. This has been clearly making me money, but still, it feels weird to have so much cash in my account (which is now about 50% long stock, 50% cash). I have a standard margin account but have never actually traded to the point where it tells me I have a margin balance. I usually stop trading when TOS tells me I only have 15-20% of buying power left.

Should I buy stock with the cash and then just leverage myself to the tits when selling options? Or if what I'm doing is obviously making me money, should I just keep doing it?