Your question is confusing...what I'm getting from it is you're looking for daily operations pain points in the marketing field to help you focus on what to build as an app?

If that's correct, pick a specific niche (an industry, a business size, etc.) and ask them.

What matters to a medium-sized organization can be gibberish to a solopreneur. Smaller organizations just don't have the problems larger ones do. That's why it's critical to pick your niche. If you build something that improves the way accounting, inventory, and CRM systems talk to each other, minimizing the number of instances what was billed isn't what was shipped, for example, that will be good for larger companies. But solopreneurs won't want it.

The way smaller companies market is different from the way bigger ones do. So focus on the kind of customer you want and the kind of problems you want to solve. My gut reaction is for you to focus on larger organizations, because they are more likely to have the kind of problems at scale that mean they can afford to invest in your solutions. Having a target market that can pay for your help is critical...and a simple point often missed by saas creators.