When I looked into starting a coding school, I realized something similar. Getting a curriculum is easy, getting a teacher is easy (I can do both and know how to outsource this as well). However, marketing the damn thing? That's hard.
In all fairness, it might be that a marketeer has the opposite view of this. This is how I came to realize that you need each other.
You need teams, eventually, maybe not in all cases, but definitely in a lot of them.
And do it early, marketing shouldn't be something you just sprinkle on at the end - there some things that make marketing easier that can be baked into building whatever it is you're building.
For the coding school idea, I imagine some level of referrals would be one of the first tools at your disposal - something that should be native to the product itself.
As in, you should build your User model with the knowledge you'll have referrers and referees, making the experience seamless from user touchpoints.
Often you see some marketing gimmicks overlaid onto the structure of the site with clunky integrations, you need to make it so that your product by design supports referring as a strategy for it to win out.
For example, Dropbox had their referral tech built in (refer someone, get free storage etc...). They set their product up to utilise their chosen marketing strategy effectively at the base level of the product. At least, it felt like it was ingrained.
In all fairness, it might be that a marketeer has the opposite view of this. This is how I came to realize that you need each other.
You need teams, eventually, maybe not in all cases, but definitely in a lot of them.