Teenager want to make friends

Hi,

I have a 14 year old who is autistic and trans and has recently begun home learning due to the school environment being too overwhelming/not meeting his needs. He removed himself from his former friendship group due to issues with bullying and is no longer in contact with anyone from school. 
He is desperately lonely but he can’t manage social situations due to his anxiety, so I’m wondering if anyone has any suggestions for online groups that might be suitable. He was in LGBT youth’s gender group but found it to be too quiet and didn’t feel like he had much in common with the members. 
Thanks.