In sum, you work an assembly line. You do lots of the same thing in a sitting.
I traced and cut four pairs of boxers in one sitting. Same pattern, same markers, same lengths of cotton in four designs. Traced then cut. Then pinned them all.
Sometimes, the assembly line is the way to go.
Now it’s time for a bunch of sewing. Two piles make it all go faster.
White thread on the left, black on the right:

White part of baby shirt, blue on white Star Wars boxers, green on white shamrock boxers:

Marvel comic printed boxers, camouflage baby shorts, denim baby shorts. Green boxers — that one actually needs its own thread.

Right now, the machine is threaded with black. I ran a bunch of seams already.

No rushing, but step by step. This is how I have to manage with so little sewing time at a time.