Here are a few descriptions for the WordPress post tag “低成本” (Low Cost) in Traditional Chinese, offering different tones and focuses:

**Option 1: Concise & Direct**

> 以最低的預算，達到最大的效益。 適用於所有重視成本效益的內容。
>
> *Translation: Achieve the greatest results with the lowest budget. Suitable for all content emphasizing cost-effectiveness.*

**Option 2: Practical & Useful**

> 分享各種節省開支、找到划算方案的方法，讓你的預算發揮最大價值。 找到省錢秘訣，提升生活品質。
>
> *Translation: Sharing various methods of saving expenses and finding cost-effective solutions to maximize your budget. Find money-saving secrets to improve your quality of life.*

**Option 3: Broad & Application-Oriented**

> 探索在不同領域，透過精打細算，以「低成本」達到目標的方式。 包括產品、服務、行銷、生活等方面。
>
> *Translation: Explore how to achieve goals with “low cost” in different fields through careful planning. Includes products, services, marketing, and lifestyle.*

**Option 4: Emphasizing Value**

> 無論是產品、服務還是生活方式，我們都致力於尋求高性價比的選擇。 讓你用更少的錢，獲得更多價值。
>
> *Translation: Whether it’s products, services or lifestyles, we are committed to seeking high cost-effectiveness. Get more value for less money.*

**Option 5: Slightly more informal (use case: a personal blog or less formal context)**

> 想省錢？ 這裡分享各種低成本的小撇步、好康資訊，讓你花得聰明！
>
> *Translation: Want to save money? Here we share various low-cost tips and deals, so you can spend smartly!*

**Key Considerations When Choosing:**

* **Your Blog’s/Website’s Tone:** Is it formal, informal, techy, lifestyle-oriented?
* **Content Focus:** What kind of content will be tagged with this? Specific product reviews? General budgeting tips?
* **Target Audience:** Who are you writing for?

Choose the description that best suits your content and your audience. Make sure it’s clear, concise, and accurately reflects the type of content you’ll be tagging. You can also adjust any of these options to fit your specific needs. You can also put the descriptions into your WordPress tag description fields to make your tags clearer.