How can I get a guardianship over my 25 year old autistic son?

How can I get a guardianship over my 25 year old autistic son?

My son was diagnosed with ASD five years ago in 2020, after a terribly upsetting incident where he violently threatened and attacked a family on Facebook over something that happened when he was in middle school. The doctor he saw at that time has a nephew with severe autism, so he was able to recognize the signs of autism in my son, and so he recommended we take him to a psychiatrist to have him evaluated. He was diagnosed with high functioning ASD after undergoing an evaluation by the psychiatrist.

Most people would say that my son probably doesn't need a guardian since he's "high functioning," but I seriously believe that my son's autism prevents him from making responsible decisions and behaving in a rational manner, and my belief comes from observing my son's behavior. For one thing, he repeatedly failed to do well when he was in college. He would constantly not do the work he was supposed to, and he would end up failing them as a result. He actually got kicked out of one university, and he ended up having to continue his studies at an online college. But even at the online college, he would constantly not do his work and fail, and then he would lie to us and manipulate us into believing he actually did well by making up forged transcripts online. He actually did this and got away with it several times before he finally got caught last year in June 2024. He thought he could hide it forever, but being autistic, he’s kind of lousy at manipulating… In the end, he finally did manage to get his degree at the end of 2024, four whole years after he was supposed to get it…

Much more alarmingly, however, is the fact that he has severe type I diabetes, and he refuses to do anything to manage his diabetes. His blood sugars are out of control, yet he still eats all of the carby and starchy foods that he wants. Due to his autism, he lacks the capacity to understand just how serious his disease is, and how imperative it is to manage it properly.

I should also mention that my 25 year old son got in trouble for playing on the swingset of an elementary school playground, and he had no understanding of why it is inappropriate and wrong for a 25 year old man to be playing on a children’s playground. The principal of the school came out and shouted at him, took pictures of his license plates, asked him if he lived nearby, and then told him to dismiss himself. I guess he thought he was a creep who was looking to molest or kidnap some kids at that playground, and it sounded like he was planning to track him down and have him arrested. I called the school, apologized to them, and told them that my son is just a young man with autism who doesn’t know how to act appropriately. I also explained to my son why he’s too old to be hanging around at little kids playgrounds.

As you can see, my son’s autism is clearly preventing him from making good choices and behaving in a rational/responsible way, which is why someone needs to be a guardian over him. How can I go about getting a permanent guardianship over my son?