The size of budget you need to target your audience depends on several factors, such as the size of your target audience, the marketing channels you choose, and the competition in your market. If your target audience is large, you may need a larger budget to reach them through multiple channels. On the other hand, if your target audience is a niche, you may be able to reach them with a smaller budget by targeting specific channels where they are more active. For example, if your target audience is on social media, a targeted social media advertising campaign may be more cost-effective than a large-scale traditional advertising campaign. Ultimately, your budget size should align with your marketing goals and the resources you have available.