If you're not happy about team selection, what will you do about that issue between now and next year to change the outcome?
Sorry, assuming your unhappiness is you think you should be in a higher team? So you need to make sure you improve more than those selected ahead of you. How will you do that by not competing against other rep clubs?
In 12 months time, should all be about you and your talent/potential and not about you declining this year. They may have a back up plan for you next year or may ask you to commit earlier, but any smart coach will select based on talent.
So work hard young athlete, put in the hours and prove them wrong in 12 months.