If you’re a BT, stick to the more MO circles, which also tend to have more singles your age.
Build self-confidence. Learn a few jokes, pick up a new language, learn to play guitar, memorize some poetry, work out. These are all things I’ve been doing, and they will make you more attractive in the eyes of the opposite gender.
And find a good shadchan on Saw You at Sinai and try out JWed/Frumster. Many people have had success that way nowadays.
And remember, yesh tikvah. A friend of mine, 37, just married a woman of 40. Her family was misyaesh and ready to write her off as a spinster, but there’s hope for all of us.