Know we have to wait a few days but just saw this...
LG V30 Software Update
Verizon Wireless is pleased to announce a software update for your device. This software update has been tested to help optimize device performance, resolve known issues and apply the latest security patches.
System Update 13
Release date: 07/05/2019
Android™ Security Patch Level: June 1, 2019
Software Version: VS99620l (That's a lowercase L not uppercase i, which makes sense given the previous version was a K.)
I think you mean US998. Hope you didn't flash it from US996 (LG V20).
Yes, flashing this VS996 firmware will deprive you of fastboot, as of the North American phones only US998 has fastboot flash commands. This is why you had to Frankenstein to US998 in the first place to unlock bootloader, install TWRP and root. US998 has fastboot flash commands.
However, by flashing this VS996 TWRP-flashable zip file, you could not have lost TWRP. You flashed it with TWRP!
Also, download mode should be there, also.
Did you follow the instruction and re-flash Magisk before rebooting?
If you re-flashed Magisk, then just reboot to recovery using either the Advanced Power Menu app I strongly recommended in WTF or the Reboot Recovery app I previously strongly recommended in WTF. (Recommended in the instructions; that post just explains them more.)
If you didn't download and install either, you can still do that -- as long as you have root.
If you didn't re-flash Magisk and you don't have root.... Then manually go into download mode like described in the Frankenstein instructions and flash back to US998 via LGUP to get your fastboot flash commands back. Then you can reinstall TWRP and re-root your phone.
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