With Nordea, it’s also worth noting that custody is free only if you make at least one commission-generating trade during the quarter. Otherwise, additional costs will be almost 6 euros. If OP’s OST (equity savings account) is not satisfactory in its terms, you should check the benefits available through the Finnish Association of Shareholders. Membership in the association is, in my understanding, a tax-deductible expense.
There is more discussion about brokers and their costs in another thread (Keskustelua välittäjistä - Sijoittaminen - Inderes forum).