Low resources and time! How to strategize Testing?

When the clock's ticking and resources are thin, ensuring your product's key features are thoroughly tested is paramount. To navigate this challenge:

• P1 Flows: Identify critical features that must function flawlessly and focus your testing on these areas.
• Test Automation: Use automated testing tools to handle repetitive tasks, saving time for complex test cases.
• Risk-Based: Implement risk-based testing to allocate resources to high-risk areas, potentially reducing the number of tests needed.

Which strategies do you find most effective for testing under constraints?