2. Agree roles, responsibilities and expectations, and areas of ownership. If you have good traction and he is responsible for driving growth in the market, it sounds like he is doing reasonably well and should probably stay in charge of making the final decision on growth for now. But do you guys have targets or growth goals in mind? If you do, and you're hitting them... just take the win and move on. If you're not hitting your growth goals then that should be enough for you guys to agree to try something different, whether that's experimenting with different pricing, marketing, product etc. Either way, having areas of the business that you can both exercise some agency / decision making over will make you both feel better. And combining that with concrete targets will give you an objective yardstick to measure whether the existing strategies are working.
Separately - it sounds like you're having trouble aligning and moving forward. Slapping on a CEO title won't resolve that. You'll have to get comfortable with conflict and a bias for action. The pricing question might not matter unless you have PMF - but your relationship could decline if you can't discuss and move forward without resentment.
A few things that might be helpful to read - (1) Radical Candor by Kim Scott, (2) Stripe's operating principles handbook.