How can I get an idea on relevance of my data?
Talk to as many people as possible about your work

This can be in formal settings, such as a poster or oral presentation at a conference. You could also ask to give a presentation to colleagues within your department. Or it could be informal, such as chatting at a coffee break or after a seminar with fellow researchers.

It's often tempting to hold on to your work and only present it when it feels "finished", but these early stages are often the most useful ones to get feedback. So you need to be brave, and accept that there may be flaws or complications that you've not yet thought of. That's why you are doing it.