How to Say "let's know" in Spanish
The Spanish word for “let's know” is “sepamos” — B1 level. This is a very common word in everyday Spanish.

Examples
Espero que sepamos la respuesta antes del lunes.
I hope that we know the answer before Monday.
No creo que sepamos cómo arreglarlo sin ayuda.
I don't think that we know how to fix it without help.
¡Sepamos que tenemos el poder de cambiar las cosas!
Let us know that we have the power to change things!
When to use 'sepamos'
'Sepamos' is the 'we' form used when the main verb expresses a wish, doubt, emotion, or uncertainty. If you state a fact, use 'sabemos' instead.
The 'Let's' Command
You can use 'sepamos' as a command that includes yourself, meaning 'Let's know' or 'Let's acknowledge.' This is the 'nosotros' form for commands.
Using the wrong mood
Mistake: “No creo que sabemos la respuesta.”
Correction: No creo que sepamos la respuesta. (Use 'sepamos' after doubt/disbelief, as the knowledge is uncertain.)
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