How do I go from Delta to Alpha?

Avatar (beta) is Alpha SA, Alpha, Beta and Delta subset at this point in time

Yes I am I’m an alpha member I only had one friend that was also in alpha and I was trying to get a hold of him but he’s no longer in Alpha he’s in Delta now he got tired of the constant updates so he unenrolled Alpha

You just have to continue to be active in the program, take part in surveys, etc. but Alpha is also by invite only so you would have to wait to be invited into it by Microsoft.

How do the Xbox One Update Preview rings differ and how do I change rings?

There are four Xbox One Update Preview rings, which allow you control when and how often you will get early access to console updates. You’ll gain access to rings based on your activity as an Xbox Insider. If you’ve been invited to more than one ring, you
can switch between them from the Xbox Insider Hub.

The current Xbox One Update Preview rings are:

• Alpha – Open on an “invite only” basis and receives updates at the earliest point in the preview window.
• Beta – Open to Xbox Insiders with a Program tenure of 3 or more months and an Xbox Insider XP Level of 5 or higher. This ring receives updates shortly after Alpha.
• Delta – Open to any Xbox Insider with a tenure of 1 or more months that has reached Xbox Insider Level 2 or higher. Depending on certain edge cases where further attention is required from Alpha or Beta rings, Delta Insiders may receive
  system updates before Beta, though this is not a common scenario. Additionally, while early system updates are not guaranteed across the Delta ring, all Delta Insiders will receive the update prior to GA.
• Omega – Open to anyone and receives system updates shortly before the GA (General Availability) release.

If you're an Xbox Insider then you will get more updates as compared to others. Even as an insider there are 4 different rings - alpha, beta, delta and omega. Being in alpha ring will result in a lot of updates, and number of updates goes down as you reduce
your level.

If you do not want frequent updates you can unenroll from the program.

That feature is only available to Alpha,Alpha skip aheads & Beta Insiders at the moment.

As you are in the Delta ring you will still need gold to play any games online.