u/Aggravating_Fly8087

Hello fellow radio enthusiasts, I'm currently operating mostly on 15m with my new DO license from Germany, but unfortunately, I'm hardly hearing any stations except FT8, and my CQ calls have never been answered despite several spots broadcasting in CW with 100W. My setup consists of an FT991a, IC706 MKII, 10m RG213 cable, and a 2.5m telescopic antenna with a small MP1 loading coil to tune to 15m. The SWR is 1.2, and I usually operate on weekdays from 3 PM UTC and on weekends from 10 AM UTC. I'm located on the outskirts of town with my antenna on the balcony of my third-floor apartment, facing west. The rooftops around me are perhaps 2m higher than the tip of the antenna. Any suggestions for improving my setup, or what am I doing wrong?