Aircraft Profile Names

I would like to change my Name on my Aircraft

The only way to do that is change to a new account or link to a different account via google or Apple. Just changing the name at the present time is not an option

I read this many times. But what is not clear to me: I have already played and have a progress. If I link now my game with an account, do I loose my progress achieved?

New account = new start. If you’re playing with a new account you start from scratch. There’s only a chance to beg the devs on hands and knees to switch your progress with a new user name. But I doubt they spend time with such things right now.