What would you do for this Autoflower?

This is my first attempt at an autoflower. I started this THC Auto Bomb by seed on Aug 19. It’s in a 5-gallon organic soil smart pot outdoor. I recently put her in the mini plastic greenhouse because it’s getting colder. I also cover her up at night time with a blanket.
I have been using Earth Juice nutrients, General Organic CaMg+, growTech Pro-silicate and Microble Life Plus C, worm castings, epsom salt and using apple cider vinegar to PH plain water. I don’t use them all at the same time of course!
The real problem is the PH of the soil. I have a calibrated PH pen and the slurry tests between 7.5 7.9 for the last week. I calibrate the pen every week. The plant is almost three months old and I think according to the timeline for THC auto Bomb she should have finished by now.

Can anyone advise on getting the PH lowered and what nutrients they recommend for this stage?

Results of soil test this morning
Nitrogen depleted
K surplus
P sufficient.

Ph pen reads 7.6 in slurry test 55.5*Fahrenheit

Does the cold weather affect any of this? The temps have been 63-66 during the day and 50-55 at night past couple days.

Thank you so much for advice I really appreciate and welcome all of it

Compost it and educate yourself more. That plant won't produce at this point.

I’m not ready to give up why won’t it produce at this point? The flowers are still developing and new flowers are coming up from the bottom, see attached pictures of inner flowers that are not as far a long as top flowers. Do auto flowers turn into photo period types? I wonder if the PH problems caused a delay in development. I’ve researched a lot about auto flowers and what I learned is that LST method of training is best, they don’t have time to recover from major pruning, you can’t clone them and there’s a lot of info on light schedules for indoor plants, but this is an outdoor plant...

I am very interested in why you say it won’t produce at this point?

thank you for your input and thank you anyone else that chimes in

Hang this where she can see it... She's got some work to do. Good Luck- I hope she gives you some.

This is the member you need to follow for Auto's.

Thank you for pointing me in the right direction! Have a great night!

Tessa