Which business account is the most cost-effective for part-time self-employment?

I had a conversation with Commerzbank bank employees on the phone who said that I could not renew my bank card because I had newly registered my business, which was why I had called in the first place.

I'd probably want to open a business account somewhere else where it's free, or take care of that as a next step. A personal account obviously takes priority.

Then I was forwarded to the business accounts employee who, as far as I can remember, offered me a free one if I received €700 a month.

That would be possible so soon after the founding if I put my focus on it.
I just want to do it in a relaxed, passive way when a programming job comes in, instead of actively looking for customers.

This business exists solely to keep me out of trouble, not to become a major entrepreneur as a solo programmer. Everything would be done illegally if I had such intentions. But of course, I don't want that.

And if I start an apprenticeship in September or maybe go to university, I won't have time to make up the full €700.

What do you advise me?

It wasn't taught in school, parents have no idea about it either, and whether I can trust bank advisors is also a question.
You are more knowledgeable about finances and self-employment.

How can I best get a free checking account with a valid EC card and ideally with a free business account with no minimum deposit.