is your phone rooted? do you twrp installed?
looks like lineage has your L7 listed, but does not give exact model number.
if you have twrp installed you can make a nandroid backup first. wipe accordingly and try and flash what is listed on their website. if it does not work, then you can just boot into twrp and restore your nandroid backup.
https://wiki.lineageos.org/devices/#lg