Before i get bashed for this, i understand that's how kids are. Yes they yell, they scream, they laugh loudly, they screech. But the issue comes when the parents do not discipline their kids or when they encourage them to be loud and obnoxious.
I often times hear and see the parents engaging in behaviour (yes playing) that makes the kids be even louder (chasing, growling at them etc). And if any kid happens to throw a tantrum or be excessively loud nothing is done, as i have heard even 40 minutes long toddler raging fits. this is not okay, this aint their house's backyard, it is a shared place so respect it.

What can i do in order to get some peace and quiet and deal with obnoxious parents who think their child is entitled to be as loud as it wants, at anyone's expense.

The place i am talking about is common property technically, it consists of 2 thin and long patches of grass, a parking lot, 2 small playgrounds (think 2 swings and a slide) and alleyways, it is shared space for an apartment complex. (and no, i cannot move because in my current financial situation i can only afford to stay in this place)

I am in a situation where i need to be very focused on my university work, in both writing the theoretical part and then making the project itself, it's very detailed work. I work best from home as i need 2 screens, and some days i have prior engagements (odd jobs, appointments, university classes) and i get home right about when most 9-5 employed people do. and that is exactly when they take their kids outside to play, right on the alleyways most of the time, not even the makeshift playgrounds.

My issue is that i cannot work on my thesis from 5-6 pm to 9-10 pm (aka when im most productive) because they are very loud. yes i shut all the windows, i played music, i put on headphones, they are just too loud i still hear them and i'd rather not deafen myself in the process. i have tried talking to the parents, and also other neighbours do not care as there are mostly families living in this residential complex and they are immune to kids yelling. they say kids they can act however they want and be as loud as they want, but if i decide to drill a hole in the wall to hang a painting, the whole groupchat of the complex blows up and i get everyone knocking at my door.
this issue will only get more annoying after i graduate, get a job (9-5 probably) and want to come home to unwind only to be met with banshee screeching. i have tried everything on my part to not hear the noise or not be annoyed by it.

Guys, i am in my early 20's, i do not want my "relaxing" time at home to constantly have a screeching soundtrack in the background, if i have kids of my own it will be later in life and i'll experience the screeching 24/7 either way then, i dont want it NOW. i want to enjoy my young adult life lol.