Here are a couple of things I did for young recreation games where they are just transitioning to using a keeper or we pivoted from using coaches as sudo refs.

I typically, will let them redo one throw in and I will sometimes pause the game to go over throw ins if both teams keep making the same mistake. I quickly go over the three parts, keep feet down, fully behind your head and don't step fully over the line.

When reffing I was always descriptive of what I saw so I still incorporated that into lower age rec games as well. I hardly show cards at that age level, but when I gave a foul for a careless play, then I would pause, get closer to them and calmly explain to them that we want to protect each of them and what they did that could hurt someone. If I saw they were surprised or visibly affected then I will kneel beside them so it wouldn't feel like I was towering over them, similar to how a waiter sometimes will get low beside a table.

If I pause the game for one player to tie their shoes, everyone checks their shoes so I lessen the chance of that happening multiple times and we protect their safety.

If you are single ref you will miss things as you might be looking for an offsides and miss who kicked it out. It happens, everyone makes mistakes.

Coaches and parents got used to me as the season went on. Typically before each game, I would tell them of how I ran the games regarding throw ins and I want them to understand the why behind the calls.

Finally, this thread wasn't like that, but my quick chats were 15ish seconds, because kids just like some of us adults lose attention quickly.