Choosing a PIN is a nightmare. You should make sure you have a different one for each card that uses a PIN.
You shouldn't use your any date such as a birthday (ddmm or mmdd) or birth year (19yy)
You shouldn't use numbers that form a line on the keypad (2580 or 0852). No sequential or repeated numbers, either. It's a good idea to avoid 6969 but I don't know what makes that so special.
You also shouldn't use 8068, 8093, 9629, 6835 or 7637 which
have been published as (statistically) the rarest five PINs in use.