is the scientific the only true method of validating a hypothesis?

I am writing an essay on critical thinking and I am using this set of sentences. When a scientist undergoes the process of validating a theory or hypothesis, they use the scientific method, which is really a systematic method of critical thinking, because a hypothesis that is not reinforced by this system of trial and error, is not, in modern times, a valid and true hypothesis. Ergo, a scientist that lacks this valuable trait cannot truly progress science. Without questioning or validating an existing fact, we will never progress, because, as stated above, the scientific is the only true method of validating a hypothesis, and the first step of this process is questioning. The scientific method, in the most basic of terms, just trial and error.