I'm excited to have my good old friend, Alex, as a guest on my upcoming Twitch stream, where we will be discussing language learning. I'm excited to have my good old friend, Alex, as a guest on my upcoming Twitch stream, where we will be discussing language learning.

Alex is Greek, fluent enough in English enough to help me with my English, and is learning Japanese. Alex is Greek, fluent enough in English to help me with my English, and is learning Japanese.

I think it flows better like this

We have supported each other in our language studies over the years on athe language exchange website, Lang-8. We have supported each other in our language studies over the years on the language exchange website Lang-8.

If you remove the name and it doesn't make sense, we don't need the commas. If you remove the name and it still makes sense, then we use commas.

I am sure that not many people will join, maybe even no one will joine, but I am looking forward to chatting with him since it will be the first time we will be talking by voice. I am sure that not many people will join, maybe even no one will join, but I am looking forward to chatting with him since it will be the first time we will be talking by voice.