[Short question] Is this agency model viable?

Hi guys,

Is hard niching down horizontally worth considering? My dream is to create a paid ads agency. No Google ads - just the ones that doomscrollers can stumble upon on Meta, Reddit, Twitter - You name it.

Isn't it too narrow? Maybe the product-market fit isn't there because businesses aren't just looking for paid ads agency but the one that also does content?

Is the only-paid-SoMe-ads agency viable? Or it's too niched horizontally and people won't even bother booking a call with me cause they're better off hiring an agency that can do just that + content, influencer marketing etc.

I just want to know whether I'm pursuing a wrong thing or not.

Thank You in advance for Your answers and Your time:)