You should retake it.
The profile won't expire until / if you get back to the pool.
Your CRS will change if the test results are different from what you have now.
Apply for restoration/SOWP and for removal order deferral, attach a restoration/SOWP application. spouse's work permit, mention your H&C circumstances, like a newborn child.
Your personal documents don't relate to parents-in laws in a TRV application, they need to show their own funds, ties, etc.
Yoga classes as employment is a tie but not strong sure.
Consider a super visa, it's more feasible in this case.