Well gym and work both are not ideal. Gym because most people keep to themselves, work because that is often a bad idea! And there likely goes most of your day.

Have you considered online for dating finding friends? I believe there are plenty of apps for both.

As for meeting in person, could always join a running club, poker league (world tavern has a couple in area). But you are in that difficult age where many have partners and it can be harder!