Very frustrated with my 8 month old kitten

Hi everyone,

It’s been a while since I posted but I am in need of some serious help.

I have an 8 month old male, I’ve now owned him for 5 months, and it has been incredibly stressful since week 2! I’m at my wit’s end with him. Hes a very sweet cat but is incredibly destructive, and I feel terrible because I’m constantly disciplining him as opposed to my other 2 cats who are the polar opposite of him.

Some back story on him, Alister was found as a Singleton at 2 weeks old and was raised by my friend, her step mom and her step mom’s mother. I am absolutely greatfull they rescued him and he’s not the first cat I’ve given a home to that they’ve rescued, my oldest Salem who’s about to be 4 was actually rescued by them and she’s perfect! But Alister is like Satan. They spoiled him rotten and he never got discipline for bad behaviors which are now a nightmare.

1. He loves playing in the litter box and kicking it all out poop included, and peeing on the edge of the box.
2. He likes throwing his full body weight into the window screen this wouldn’t be a big deal but seeing that I live on the second floor it stresses me out, I sometimes have to keep him in the bathroom 3 times a week so he doesn’t do this while im sleeping, I do not want to wake up to him flying out the window.
3. He has to use every single litter box that I’m next to even if he just literally used the potty not even 5 mins ago.
4. He tries to eat everything including things that are poisonous to cats! I’m always worried he might end up dead i constantly have to make sure there is nothing edible around or in the sink I caught him licking a knife!
5. Hes destroyed the paint of my closet door, and my main door into my apartment.

I have tried correcting his behaviours like I’ve done with the other 2 in the past but it absolutely doesn’t work. Now I don’t believe in getting rid of their pets and I’d really love him to be like poe and Salem who are not destructive what so ever. They have hiding spots, they get new toys every 2 weeks, and on Saturdays and Sundays if the weather is nice they get to go outside under supervision of course.

I just really need some tips or insight if anyone has any, thank you.