Pin Keep Reminder to notification shade? How do I pin my todo list (which is a reminder so that it appears on my calender) from keep to the notification shade?
There's no native way in Android to do it unless the app itself implements it. However, some hacky ways to achieve it-


Using apps - Boomerang Notifications and Pin Notifications
Using Tasker - https://www.reddit.com/r/tasker/comments/4orcfg/make_notification_persistent/d5h8ln9/
Xposed Module - https://forum.xda-developers.com/xposed/modules/4-1-pinnotif-pin-notifications-to-avoid-t2765095 (Not updated in a while, will be incompatible with latest versions of Android)