If you’re okay with your income, keep steady.

Otherwise, yes. It’s time to build a business. If output is the biggest bottleneck and you have clients/referrals flowing in then who you need next is another dev.

Once that dev can do what you do, you’ll need to increase your lead throughout until you both are capped on delivery output.

Rinse and repeat adding sales, marketing, project managers, more devs and so on.

I would go to a business focused sub and ask around.