Credit Card Limits

First post (lemme know if I’m doing this wrong)

I’ve been in Japan for 5 years+ and make double the average salary. For years I was unable to make a credit card due to issues with my name.

Once I solved those issues I tried to make one at my bank (Mizuho) and got rejected every time with no explanation.

I finally made one with Rakuten, but only got a ¥100,000 limit, which isn’t really useful for any adult. I used it for 6 months (~70% utilisation) and paid in full on time.

I just applied for a higher limit and was immediately rejected again.

am I doing something wrong??

(Notes: I have no debt, solid savings etc.)