A firm can encourage its employee advisors to contribute to business development efforts by becoming a 'big fish in a small pond' and using niche marketing.
Instead of constantly developing a new marketing plan each year (or quarter, as I recommend), it's best to work the plan. In those periods, establish a marketing routine rather than creating an entirely new plan.
Treating marketing as an experiment can help you try different tactics, measure results, adapt to trends, and learn from failures to grow your business.