Based on the relationship you have with the owner that’s also in both businesses would it be easy for you to sell out of the agency and truly get out completely?
Or, is it one of those things where they would still try and pressure you or you would have some obligation providing your skill set over there even after you sold.
If you can make a clean break, and you truly don’t like doing that type of work - then I can understand selling your share. When you have work you really like doing then life’s too short to do the work you hate.
In general due to similar people being invested and owning each biz it might be tricky to remove yourself and still be in good standing? I don’t know.
Also, if you don’t see the agency 10xing in 3 to 5 years then you’ll likely do a lot more work you don’t like for not much more revenue and not really that valuable of a biz.