New airlines

I wonder how to start good since my airline is running at an constant loss and i wonder how to make it succesful

What is your airline name? reseting is not always the best option.

Fly Stockholm

Put some money on route marketing for about three days and wait until aircraft occupancy improves. There are other things to consider such cabin configuration that depends on the number of passengers. You can do a study on the route research page. The distance is another point to consider.