Yes, you can apply for a higher purchase and credit limit as follows:

Log in to the FOREK Credit Cards app
Log in to the Kreditkortportalen

Call Customer Service on 0771-22 22 21

If you want to apply for a higher purchase and credit limit, Entercard (credit card issuer of FOREX Kreditkort) needs relevant information about your income, etc. Entercard then performs a new credit check.