Regularly delete stuff, you dont want your sd card popped out and accessed. The devices are encrypted but the sd card is not ... At least my device doesn't have that option. I also ensure I have backed up my 2FA codes if the phone is lost or stolen, you dont want to be locked out of your accounts. freeOTP+ allows you to export them.

I used to cover them camera with tape but I have to many signal video calls for that to be workable.