Would you buy a vehicle you were uncomfortable driving? Of course not you would find the right vehicle with the right specifications so you benefit from the right decision. Same goes for hiring. You wouldn’t expect to be hired if the competition has excellent persuasive soft skills along with everything else required and you don’t would you? Sometimes we have an off day but just don’t allow that to be on any interview dates you accept. If something personal happens to put you off your game tell the interviewer why your mind is wandering. You don’t have to be specific but share why you may appear uninterested and explain how you are absolutely interested. If you feel you are lacking or need to upgrade your skills in any area, now would be the right time to focus on you.