Problem getting Witnessed

Hello, My Heltec M-2808 has not received witnesses for a long time. I tried 3 different antennas and cables, unfortunately my problem was not solved.

my ip address: fixed
Port status : open
my internet speed : download : 50mbps
Upload: 11Mbps
Location selection: exact point with device location.

device name : careful rasppbery locust

I’m waiting for your help. I am attaching the device info screen picture.
Please help.

Is your antenna really at 20m? If so try dropping it down about 5m. Seems way too high unless you are surrounded by tall buildings or trees.