I wrote my Duolingo English test twice, I got the same 100 result, Should I try again or I should start looking for college for my masters.?

Duolingo English test score of 100 is respectable and accepted by many universities for master's programs. However, the decision to retake the test should be based on the specific language requirements of your target universities. If your score meets their minimum requirements, I recommend you start focusing on preparing your college applications. 

This includes working on your essays, updating your CV, and gathering your academic documents. It's also important to start researching universities and programs that align with your academic and career goals. If, however, your preferred universities require a higher score, then it might be worth retaking the test. Remember, a well-rounded application is key to a successful admission process.