I think I need to say what others won't. This map, as of right now and it's previous iterations, have been crap. This is nothing against you, or your want to map as I would love you to make maps, test them here, and enjoy doing it, but this map is bad. Everyone's first map is crap. My first map was a laggy, overscaled, barely functioning mess but I learnt from harsh criticism and so I would like to pass that to you.
An open field or an L won't cut it for a layout. The most popular and balanced maps are varied, have routes and paths that snake leading to interesting fights and most importantly lead to strengths and weaknesses for all classes. Your map is a playground for soldiers and snipers, and nothing else. Size is another thing that can be tricky. Scale takes a lot of time and practice to learn and even then the best of us don't get it right a lot of the time, but we fix it and change things before releasing them. Having a 2000x2000 block and saying "go shoot" is not a design, it's laziness. You have to have low areas, high areas, vantage points, doorways, corridors, staircases and all other manners of level design that lead to interesting battles for a map to be good and be both fun and challenging to fight on. Making a map isn't about a land for people to walk about. It's about creating an ecosystem of which all players can use, and manipulate that ecosystem to their playstyle and classes advantage.
What I am trying to say is don't just make a field and complain when people don't want to play on maps that are just fields. Take some time, take inspiration from other maps, look at what makes your favourite maps so fun to play and then design a comprehensive and truly enjoyable map. I hope you can take this feedback and really embrace what I saying.