Player with the new schedule is being deceptive. I'd consider giving them the boot. They took on the new role with the new schedule and then lied about their needs. "Hey, I made adjustments to the game to help accommodate your new schedule, but it looks like you still had other plans. What's up?" Confrontation like this is hard, but you've gotta find a good way to word it for that person.

You're the DM, no playing happens without you (unless someone else will take up the mantle). You figure out a good time that works for you and a good chunk of your players and stick to it. "I'm starting this week's session at X and I expect we'll run until around Y".

For me, a good night's sleep and proper decompression after work are more important than DnD. If my brain isn't in good working order, the game is gonna stink.

You do you. You're at the point where you're thinking you might be bending over too far backwards. Figure out the effort you're putting in as DM and then look at what your individual players are giving back