Explain to me exactly how I can bypass a Fritz Box wlan on the Nintendo switch?

I created this account to ask how I can bypass this lock, I really despair. I did it on my cell phone but somehow not on the switch would be nice if someone answered

Give the switch to hootspoot through your phone

Why?

Can I do this via WLAN or do I have to do it via mobile data?

That should also work over WLAN

So that I can play outside of the Wi-Fi time, of course

No, you need the card in my cell phone for that, there's another way