It's fantastic that you want to advance in your career. In light of your experience and current position as a mobile application testing engineer, you may want to think about the following options:
Automation Testing: Acquiring knowledge of frameworks and tools for automation testing, such as Appium, Selenium, or Espresso, can be very beneficial for testing mobile applications.
Mobile App Development: Gaining an understanding of iOS and Android mobile app development will help you become a more proficient tester by offering insights into app behavior.
Investigate methods and resources for performance testing mobile apps under various loads and circumstances.
Security Testing: Develop your talents to find risks and vulnerabilities in mobile app security testing.
Test Management solutions: To enhance your test case management and reporting, become knowledgeable about test management solutions such as Jira, TestRail, or Zephyr.
Learn about DevOps techniques and Agile approaches as they are being included more and more into the testing and development of mobile apps.
Continuous Testing: To make sure that testing is a continuous and essential component of the development process, familiarize yourself with the methods of continuous testing.
Develop your skills in mobile app accessibility testing to make sure that all users, including those with disabilities, can utilize the app.
Certification: To increase your credibility, think about obtaining pertinent testing certifications like the ISTQB.
Soft Skills: As they are essential to your testing position, don't overlook honing your soft skills in communication, problem-solving, and critical thinking.
Login via social account