Well, the person you are trying to find will most likely ask herself the same question and will probably get the same answers from the community. I'd skip the "going to party and look for girls that look sad or bored" advice, pobably a waste of time. If you try online dating seriously, make your intensions clear and dont expect many matches. Quality > Quantity.
Focus on stuff you like. Honestly, only sitting at home and eat pizza and watch netflix for the rest of your life will get you depression and probably health problems :)
You have some interests in Movies? Head out to the cinema, especially those preview nights or testscreenigs are very goot to socialize.
You are interested Food? Just look for cooking classes around your area. 90% of the participants are female and you will have a nice conversation base. There are pizza courses in my local town as well, give something like this a try!
Out of my own experience: dancing is a great way to find those "wallflower girls". Not this club-drunk dancing. The standards are as well primarly joined by females. As a male, you will surly find some girls to dance and socialize with.
And as always, sport is a great way to get in touch with others.
Another Tip: think about "If i would organise a date that is not a netflix- or a coffe date. What would it be? What location or activity would make me happy?" Is it going to the zoo? Great, go there. Maybe get those guided tours (interested in learning about photography? Zoo is a great location for this as well). You like Bowling? Get there with friends, coworkers or students you like. The more you socialize, the more you will get invited to birthday parties. You will not feel alone and maybe meet a nice girl.
If you realy have 0 interest in any activities, you will face a rough time dating and meeting girls. Your only hope is get lucky enough to get matched on online dating or to hit at a girl at school/university/work...