If the touchscreen issue derives from the ROM, it is not going to respond even from recovery mode because your device is still running Lineage OS 19.I found that my touchscreen won't work even in the recovery mode(lineage os 19 recovery mode)
Which brings you back to my previous post #14.
-- Reseat your device back to OOS or flash another Custom ROM to determine whether or not the device or the nightly LOS ROM is the culprit.