Help plant is fading

Have you you re amended your soil since you started growing ??. The nutrients in the soil will not usually last an entire grow for weed .

Your plants are nice, at the end of cycle leaves tend to fade, especially if you underfed them,I personally don't see any issues, just beginning of the end. Some strains bulk up only on last few weeks before harvest, you have tall well packed colas, give them time to mature, if they won't go fatter, at least they will be solid by structure. Keep on growing !

You still have 3-5 weeks left to go there friend. Give it time this strain says 56-70 days of flowering. You’ve got 5 weeks of flowering done so far so you’re halfway there. These next few weeks she will change. Just need some patience. I don’t really see a problem with your grow. Just keep maintaining your environment and your feed/water regimen and wait and other 3-5 weeks. Good luck friend you’re doing well. 🤙

You could try moving the lights a bit closer and giving them more photons. Test it out and see if it works, worst case a bit of light burn. I tend to keep mine 9-12" away but that's what works for my lamps. Every lamp is different. gotta know your lights power in terms of PPFD. Also autos feed heavy and fast in flower, I think they can take advantage of extra CO2 if available and that's how they get real thick. Also only seen super dense thick buds on drip/DWC hydro grows. Best of luck.

I just grew autos and they don't tend to fatten out I got 21g most from 1 plants they dry to nothing and weigh nothing not worth it in my opinion although lots have better luck photos for me now all the way

Not fading... but my question is if it has peaked ? Perhaps you are at maximum grow with that cultivar. Though I am not sure myself.