Was wondering is there any way to get into alpha skip ahead or is it purely invite only

You don't first there is the alpha which you can join for alphas

And there is the skip ahead keep in mind it's also the most buggy since it is the first relEASE

And you have to get an invite for skip ahead the only way to get into that is by doing a lot of feedback on the other rings and you will get sn invite eventually even they have room and based on your feedback

There is only a limited number of free slots in Alpha/Alpha Skip Ahead.

If someone in Alpha/Alpha Skip Ahead leaves, or is removed due to inactivity, participants in Beta are invited to Alpha. However, Beta participant invitations are sent out to those, that leave valuable feedback, find bugs, and are most active in the beta
group.

So it's not how long you are in the program, but how valuable your input and bug reporting was in the past.

Added to the fact that invitations are only sent out if there is new room in Alpha, you might have to wait a while to get invited. Just provide good feedback and be patient.

Not sure how they would just kick you out. I know that they can remove you from Alpha and Alpha Skip Ahead if you aren't active enough but you should be able to get into Beta. The only other way you'd be kicked out is if you had any enforcement action.

As you know the two Alpha rings are invite only by the development team.

You dont apply for skip ahead you get invites

Alpha is application

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.