>>slasht+I81
Is there any way to make it safe? I've bought newer pixels and they are a downgrade all around for me. I just want security updates and the ability to browse on-device files/do file management (newer Androids keep restricting further and further)
>>cobert+Sc1
LineageOS is not the answer. Check out the DivestOS, it is known for supporting 'out of support' devices. but I would strongly suggest you to change your device, that is too old. There is new vunrebility each month.
I am curious because I have been using LineageOS on Pixel 2 / Pixel 2 XL phones for a while (and it works very well, I might add), but I am kinda clueless when it comes to Android security.