This is from senior member (Another)
My phone was just like yours used this method and it booted into boot loader.
I'm sure your phone is fine. you are using an outdated twrp and probably messed up a partition. Unplug phone, hold vol up and power for exactly 10 seconds, let go of both, then hold vol down and power. This should take you to your boot loader. get new twrp img from official site.
fastboot flash recovery twrp.img
fastboot erase cache
boot to twrp and reflash rom.