What to do when receiving an unsuitable but still relevant answer?

On the 28$^{\textrm{th}}$ of June, I asked a question on the main site which has soon received an answer proposal; even though the concerned input is certainly relevant to my question as it provides a different insight on the matter, this is in any way an answer to my question. Indeed, I feel like I narrowed the framework of my question with some really specific restrictions that the answer received does not at all fit in. While I did not accept their answer and explain to them why I won't, some users may think that my question is settled. Therefore, my question may not receive any accurate answer; this raises the following questions:

• When receiving an unsuitable but still relevant answer, what should the original poster do to keep interest in their question?

• Is it acceptable to mention in the title that the question is still in need of an answer yet it has apparently already one?

• What can I do to avoid receiving that kind of answers in the future? Was my question unclear?

Don't get me wrong, if you find that I kind of sound salty, I am not that upset with the answer I received; I am really just seeking an accurate solution to my problem. I thank you for your feedback.

Edit. Please note that I do not take the downvotes personally, but I really care why you do disagree with me. Do you find that the answer received suits my requirements?