Help... OnePlus 6t Not allowing updates or reinstall of TWRP OR NEW OS.


Hey, everyone, I'm hoping someone can help me with this issue. So, I was avoiding any updates because I didn't want to lose root. Well, I eventually did update Lineage and lost root. Now for some reason I can't regain it. I have a OnePlus 6T (T-Mobile, bottloader unlocked, obviously
), Linkage 17, and Magisk. Originally I flashed TWRP as a temp recovery, installed Magisk and Lineage (and Root Checker), and everything was fine - until the update. Now when I try to sideload with ADB nothing happens. I just receive a CMD error "ADB: requires an argument..." Long story short. I'd like to know how I can just completely start over, from scratch, flash different OS and keep root. Any help would be appreciated. Thanks in advance.
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