The latest draft of the logline sounds more complicated than it needs to be, as it seems as if you added more adjectives but havn't changed the premise. I believe the premise has a lack of stakes at its core, and? no amount of descriptions will increase them.
Being ex communicated or disowned by his family/community just ain't enough...
Think of the story from a different angle, what else can your main character do that will (as DPG and I said) increase the stakes and make them personal.
Secondly the obstacle isn't great - he jumps on a bus, goes to the launch site, sees the launch, end of story. There is no challenge for the main character. You could make him wheelchair-bound or give him Multiple Sclerosis, anything that would inhibit his ability to make the journey would be better than nothing. By the way the fact that he comes from a community that likely forbids the use of public transport, is not an inhibition it's an inconvenience at best, as he decides in act one to go anyway.