Where to find a marketing cofounder

I've built two Shopify apps this year - an analytics tool and an order editing app. Recently bought out my partner, and now I'm stuck in the classic developer's trap: The products need constant work, leaving zero time for marketing. The few customers I have absolutely love the products and stick around, but growth is non-existent. I've got two years of runway saved up, but I spend every day buried in code - I’ve recently a had more time to try get more users but it’s really not my thing. Should I keep going solo and somehow force myself away from development to learn marketing? Or bring on a marketing co-founder and give up equity? After just buying out one partner (he lost interest right after we launched), I'm hesitant to give it up again. For those who've been here - what worked for you