"Friendly reminder" is typically used for reminding people of common knowledge. Especially for beneficial but inconvenient things that some or most people neglect to do, either because they're annoying, inconvenient, or time consuming. Things for which busy people might need a "wink wink, nudge nudge".
Friendly reminder to floss. Friendly reminder to have your cancer screening. Friendly reminder to check your tires. Friendly reminder to file your taxes early. Friendly reminder to drink more water, eat fiber, etc.
We’ve banned this account for repeatedly abusing other community members and refusing our requests to stop. We've given several warnings and been more than patient but if we are to have any standards at all, eventually enough is just enough.
Everyone who is banned is able to be unbanned but we need to see a sincere effort to observe the guidelines and participate positively, sustained over a reasonable period of time. For the time being, other community members can vouch for your comments if they are good.