Grateful for the replies guys. I haven't tried any other methods beforehand or any other wallet, but i did not dump all my coins because exactly as you said, in case something didn't work. Everything seem to work fine so my BTC is already stored cold.

Thanks for the replies, guess i'll be just adding money to that bag of btc stored cold and won't swap to anything else for time being.
I definitely am interested in the Trezor though, when operating with big money an investment of 80-100 euros is nothing really and it seems to be incredibly useful and provides a lot of good functions.
Having a cold storage you can safely spend money from and also generate an additional security layer like you mentioned is interesting and i'll be looking into it for sure. Storing ETH at the same time sounds good too.