5yr old lacking motor skills FRUSTRATED!!!!!!!

Hello everyone this may be off topic but I need a little advice maybe story telling for any relatable situations. My son is now 5 and he’s having trouble with doing things for himself because he can’t seem to use his hands. He doesn’t know how to grasp on to things for example, button his shirt, open play-doh, write/ trace, any thing related to motor skills. He had therapy at age 3 but it’s still no progress and he’s 5 it’s very frustrating I try to keep my patience but I want my son to get help and excel in school. Him not being able to do so much for himself I didn’t enroll him in school at 4 but I have to now he’s 5. People was telling me maybe school would help him, but I know people can be mean and everyone don’t and won’t have as much patience with him as I do as his mother. I’ve tried methods I’ve seen on YouTube but he tries his best I can see he is and it makes me so freaking sad I cry sometime I do because I just want my boy to be ok and be happy at school and not bullied because he’s lacking a few things he should know at his age. He knows so much he’s not lacking any learning abilities it’s just him using his hands he can’t even push a freeze pop up and other kids laughed at him when he asked me for help at a birthday party. :( I’m just overwhelmed and I don’t know what to do I’ve Made an appointment with his pediatrician again to see if he can get more therapy in school or what not whatever they may have to offer. We’re in Chicago it’s not too many nice people or kids here. So I’m afraid for my son in this messed up world. Any tips, advice you may have please share with me please. Please no mean comments I’m just a worried mom needing assistance with my kid motor skills that’s it.