Help me

Ive been creating maps for a while and i believe some of them are good enough to maybe keep 50-200 consistent players but all the maps i create seem to gain players for a day or so and then drop completely down to 0. Im sure this is because of my game not performing well but the thing is my average play times are around 10-15 minutes, my retention is pretty much 1% so im not sure why my games dont even have a small consistent player base like 30 people