There are a lot of misconceptions about what makes someone more attractive, you have a lot of industries that are trying to sell you all kind of products and services.
Like the cosmetic industry for example, they will tell you that you need to cover your natural sent with deodorant or put paint on your face etc.
There are two things that we look for in particular whenever we determine someones attractiveness other than things that are related to genes, we look for someones vitality and fertility.
This is what you are actually trying to fake with cosmetics, whenever your body is healthy and it is not polluted on the inside you aren't going to have any unpleasant odors, also you are going to have a uniform skin tone without any zits or breakouts.
We use our skin as an emergency excretion organ, whenever your normal excretion is being overwhelmed you start excreting some of the excess toxins through your skin.
With cosmetics you are trying to create the illusion of health, rather than do the right thing and maintain your body in a healthy state.
Even the purpose of a kiss is to collect information about someones health. This is why we kiss each-other and this is why it is pleasurable, or not if someone has a bad breath, it indicates toxicity and poor health.
If you are a man chances are that you don't have any fertility problems, luckily man have very robust reproductive organs that malfunction a lot less. If you have any problems with attraction it is more likely that they come from a lack of vitality.
The common wisdom to solve this problem is to micromanage behavior, like coach man on what to say and how to behave. But things like body language and the inflection of your voice are largely subconscious and you have very little control over them.
To tell someone that in order to become more attractive he has to control his body-language, it is almost an impossible to execute challenge. Behavior takes care of itself whenever you create the right circumstances, the only thing you should worry about in an interaction with someone is: listening to what they are telling you and maybe logistics, not about how your voice is sounding, or if you are holding enough eye contact etc. that it is actually creepy and manipulative.
Whenever you feel different you behave different, there is a very tight connection between behaviors and emotions. You can't change behavior without changing emotions. Like if you are going to have a good night sleep, you are going to feel more rested in the morning so you are going to behave different than when you don't sleep so well.
Reproduction is a non-vital function, you don't need it to survive, so whenever you are under some sort of chronic stress your body shuts off non-vital functions in order to preserve energy. Like for example if for some reason you can't get enough food, one of the first things that go is your reproduction function, your libido decreases women lose their period and man can't get an erection anymore.
The lack of attraction is a symptom not a disease, this makes it impossible to treat directly. Everything that will raise your vitality is going to make you more attractive. It is as simple as sick people are not attractive this is why you don't go to the hospital to find a girlfriend or boyfriend.