Seeing that some people are looking for a sequel to the first one, I decide to go more in-depth of each bullet point.
The first thing you must do is ask yourself whether you are physically, emotionally, financially, socially, and spiritually well.
Physical wellness is about your physical health. A fit, healthy person will seem like a more attractive partner than a sickly or obese person. If you are sickly, obese, or disabled, then you may experience difficulty in attracting a mate. In that case, you may have to (1) look for someone like you; (2) find someone who is willing to overlook your disability or undesirable trait; (3) change yourself so you become a normal, fit, and healthy person; or (4) adapt to the real world while living with a persistent disability. If the last one, then hopefully your partner is willing to tolerate the disability accommodations that enable you to function like a normal person.
Emotional wellness is about your ability to handle your negative emotions in a mature manner. Throwing a fit when something is not going your way, bickering about trivial things, and feeling extremely anxious and depressed for a long period of time are not mature behaviors. A romantic partner may not want to hang out with you, if you handle things too immaturely, because a romantic partner is looking for someone he can raise babies with, not a baby as a romantic partner.
Financial wellness is about your ability to handle your money. You don't have to be a millionaire or billionaire to be financially well. You just have to live below your means, pay your dues, and understand the ins and outs of your checkbook.
Social wellness is about your ability to socialize with other people. Social ineptness is a weakness, a sign that you cannot communicate effectively with other people. Given that finding a lifelong soulmate is ultimately about adding someone to your family tree, you should be able to communicate effectively with your potential lifelong partner/family member. Otherwise, family life would be hell for you.
Spiritual wellness is about finding a strong sense of purpose and meaning in life. You may be a religious person who believes that God calls you to do something. Alternatively, you may be a non-religious person who believes that your natural calling is to serve people by providing quality medical care. If, however, you are the type of person that feels like a loser with no sense of direction, then you may want to seek help in shaping your own future identity. Maybe ask your parents for advice, or ask someone at a government employment agency about an appropriate career choice.
To sum up, you just have to be physically fit and healthy, emotionally mature, financially stable, socially personable, and spiritually fulfilled to find success in dating. I may also add traditional skills that may improve a woman's marriageability into a good family (though, it may not apply anymore) like cooking, sewing, literacy, and playing a musical instrument. These "traditional skills" no longer apply to Western women; however, they may be very useful life skills to men and women. As for "traditional skills" for men, they may work on their charisma.
The ability to persuade charmingly is a skill that may be necessary in getting your prospective wife's father's approval (and maybe your own father's approval) of the marriage. Receiving the elderly parent's blessing is still custom in many Western families. Like the traditional skills for women, charisma is no longer limited to men. Women also need to have a charming character to win hearts.