What exactly do I need to flash to go fully stock on the unlocked variant?

Sorry, I've been on a custom ROM this entire time but I want to flash everything back to stock. I think I'm still on the 1.5xx or 1.3xx baseband, with TWRP. Trying to get to the 1.8xx with stock recovery.

Thanks!

What exactly is taking up space in internal memory?

I tried using ES file explorer and SD Maid to analyze internal memory as i have only 500MB of internal storage free and Im not able to install any apps. I was really shocked after seeing the results as if you manually add up size of each individual folder, they hardly add up to 4 GB. I want to know is there any app or some method by which we can thoroughly analyse the internal storage something like spacesniffer for windows?
My device is rooted and running on stock rom( android version- 6.0)
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What exactly do game more interesting?

What exactly do game more interesting?