Not recieving any invites on Alpha Xbox Build.

Alpha/Alpha skip ahead is as far as i know by invite only. You should been an insider for a long time and give proper feedback to the builds.

I assume you are referring the the Xbox Insider Preview program. Alpha and Alpha Skip Ahead are both invite only, by the development team. These two rings get frequent updates and sometimes the most unstable builds. So if you are not happy dealing with
bugs and reporting them, then no it isn't worth it.

You must be invited to become an Alpha Insider or Alpha Skip Ahead Insider, to do so You must Very active in Xbox, doing missions and report the bugs You see in the system, as much as You do this, so You Will be Very close to become an Alpha Insider. You
must be at least in Delta preview to become an Alpha Insider, but You Just need to be an Insider to be invited to become an Alpha Skip Ahead, but this one is very rare to be invited and there is a certain number of people to be invited, no more than that,
If You were not invited to be Alpha Skip Ahead certain time, so You must wait a Second chance when they Will invite New members.

As denis97g stated the Alpha ring is invite only. When they need more Alphas, then they will send more invites. Just keep reporting any issues you find, and continue with the activites like filling in questionnaires, quests and polls.

To be a alpha member you need to provide quality reports and they might invite you but at this stage they are not inviting new alpha members as the alpha ring is full but usually every 6 months they invite new members to alpha so the best way is to wait
and submit reports