There is no one-size-fits-all formula for balancing between short-tail and long-tail keywords in your paid media strategy. The optimal keyword mix depends on various factors, such as your campaign objectives, budget, industry, audience, and competitors. However, some general guidelines to achieve a balanced keyword portfolio include starting with short-tail keywords to gain initial exposure, traffic, and insights into the market and audience. Additionally, long-tail keywords can be used to refine targeting, conversion, and profitability. Furthermore, analytics and reporting tools should be used to measure and compare the performance of short-tail and long-tail keywords. This data can be used to identify the best-performing keywords, eliminate the underperforming ones, and adjust bids, budgets, and strategies accordingly.