Where do millennials in SG make friends these days?

I’ve been in Singapore for 11 years and I’m married, but lately I’ve been feeling that it’s harder to make new friends as an adult. Since I don’t have kids, and many of my friends have and they also moved back to their home countries, I’m hoping to find new communities here.

Does anyone know any groups for travelling, hiking, gym, ClassPass classes, AnytimeFitness or even just exploring restaurants and cafés together? I’d really appreciate any suggestions.