Bottom line the plant wasn't able to be all it could be because it didn't have enough light energy. It doesn't mean it's ruined, it just means your potency and yield suffered significantly.
Your previous grow was outside so I presume that's an option available to you. If you can't upgrade to a better light you can always give it a few hours of outdoor sunshine to boost the DLI.
If you've been flowering for 8 weeks then now would be a good time to get an up close look under magnification to see if those trichomes are mature enough yet. Let's get this run across the finish line and go through the motions of properly drying and curing so that you can eventually do it from muscle memory.
We want:
- More plant energy
- Less aggressive defoliation
- A good understanding of the feed and watering cycle
- General idea of nutrition needs of the plant (good) and an understanding of the shifting ratio at different growth stages (even better)
- Time to invest in reading the plant and it's signaling
You'll get there... Let's get this one wrapped up and thinking about everything that was done, what worked and what didn't and use the time between now and your next run to check as many as boxes as we can from the above.