@Gernella, I hear you. I've been there - this is the first year I've been brave enough to attempt such a huge challenge.
Everyone might have different strategies, but I think there are some general things that helped me to finish in the time-frame - you've probably heard them before:
1. Used patterns I know and used them more than once, with different fabric or style/finish details to make them look different.
2. Simple designs are a blessing - my favourite pull-on pants pattern has just
one single pattern piece and just two pieces of fabric to sew! I can have them cut out and fully sewn up in a couple of hours. The trousers/jeans with their fly facings and shields, yokes, bands, pockets and top sewing took a day and a half each - much harder to find that much time. I only contemplated them once I had the simple stuff out of the way.
3. Used the same fabric more than once in different styles and sewed them up one after another to minimise pre-washing/prep time for the fabric and thread changes once sewing. I also generally pre-wash all my fabric as soon as it comes in, so I know it's ready to go as soon as I take it out of the stash.
Things that might be specific to my situation:
1. We had something like eight days of continual rain - perfect excuse to lock myself in the house and do nothing but sewing. I was sewing from stash, so had everything on hand. I managed to sew up half my collection in that time.
2. I'm retired, single and have no children that I need to feed and wash, etc - that probably gives me, what, about 60 extra hours per week to sew?
Even then, it was going to be a close call without that rainy spell.
3. I was in a dire situation clothes-wise, having worked out that all my existing clothes either didn't fit or were very worn. This collection, with only a few extra pieces, makes up the entirety of my wardrobe. I either had to convert some of the stash to the wardrobe, go naked or, even worse, go into a clothing store - eek! Strong motivation, right there.
No Santa's little helpers here. My cat does insist on me pulling up a chair for him right beside mine at the machine, so he can be close to the action. But he's a pretty useless assistant, he just sleeps on the job all day.