Does a cajon need a snare?
Cajons may have snares to add some rattle or buzz to the tones. However, some cajons are purpose-built without snares. The two sound very different: know what you want. ... A bit of buzz of the snare with the bas tones works in a similar way, aiding with projection & helping the cajon to be heard.
How can I make my cajon sound better?
If you have a Cajon whose tapa is attached using screws, you could try loosening the topmost screws on each corner. This will create a tiny space between the tapa and the core shell of the Cajon. Therefore, when you slap the tapa, it will hit the shell and produce a much better slap tone.