Lived over there for 2 years including during the pandemic. Found michat and WeChat useful. I also found tinder to be useful. With little effort I ended up with a couple of contacts who became regulars - not WL/ML but local women who were keen to have fun with bule (white foreigners).

Jakarta has an amazing nightlife and once you get over the crowds, the scooters, traffic, air pollution and other annoyances it’s a great place. Enjoy.