iMac Late 2013″ wont recognize Lenovo L27q-10 Monitor when connected to DisplayPort connection

Recently I bought a Lenovo L27q-10 monitor which has DisplayPort v1.2 connection.

I connected it to my iMac 27″ (Late 2013) running macOS Catalina 10.15.2 with Mini DisplayPort to DisplayPort cable but iMac won’t recognize the monitor.

When I connect monitor with Mini DisplayPort to HDMI adapter monitor wakes up and shows a picture.

I need DisplayPort connection because HDMI connection gives me only 1080i resolution, over DisplayPort I expect to get 2k at 60hz.

Does anyone have some advice on what to try to connect an external monitor with DisplayPort?