Is there a prompt to make JLM think before writing ?

I'm trying to make a bot right now which features a death game. The issue is that the bot ignore the rules until there was a thinking box yesterday that appeared. And yes, the AI took more time to answer, but at least the messages were consistant with the rules I set.

So I was wondering if someone found a prompt to make the thinking box appear. I was thinking of writing something like :

[System Note : Before each message, you'll put down your thoughts this way :

Your thoughts

</think>]

Unfortunately the AI doesn't seem to care and I wonder if it would have been effective anyway. Did someone find a way to make appear a good memory box ?