To become a passionate software tester, you need to learn new topics and skills on software testing that challenge your intelligence as max as possible. Investing in a smooth path does not pay off in the end. This post is based on a remarkable book written by Chad Fowler, The Passionate Programmer.
Jerry Weinberg said that source code gives answers to how a feature is implemented. It does not answer the question, why was implemented in first place.
Passionate software testers ask a lot of why questions.
I learned to type with ten fingers, and I know the basic algorithm for solving a Rubik cube. Both those were intellectual challenges, but those made me a better passionate tester.
You can start with problem-solving skills as one possible option to invest in your intelligence. How AI works is also a good option. Enrolling for BBST Foundations instead of ISTQB is also a good option.