Different people value different things.
Whether or not a job, a house, a partner, a research idea or anything else is suitable or good to you will depend on what you see as valuable. For your thesis then, there are two useful sets of questions to consider.
First, what do you value in your field? What is it that you think is “good” or “useful”? What topics or ideas do you think are better? Consequently, how do you see your thesis as being valuable? What contribution does it make? Why does that align with your idea of what you value?
Second, what might others value in your field? What might they then see as being valuable in your thesis? What ideas are people looking for? What contributions have you seen others value recently, at conferences or in papers?
Different sets of values might still find common valuable features in your research. Perhaps by considering what others find interesting, useful or significant, you could find a new perspective on your research.