Yes, simply speak with your employer as Moonworkers allows them to amend your situation.

Here are the different options that you have:

If you are assessed as an eligible jobholder

Opt-out

Contribute more

Re-join

If you are assessed as a non-eligible jobholder

Opt-in

Contribute more

Opt-out

Re-join

If you are assessed as an entitled worker

Voluntary join

Cease membership