A strong PIN does not contain personal info, such as your date of birth  or address. It should be a number only you know and can’t be easily guessed.
Jun utziläj PIN k'o chi man ruk'wan ta retamab'al winäq, achi'el ri ruq'ijul ralaxik  o ri awochochib'al. K'o ta chi jun ajilab'äl ri xa xe rat atetamayon chuqa' man ta anin nilitäj.