Hey! I have a question. I want to have a system on my server to give active players new ranks. So, how can i give them a role, without replacing the previous rank?

I mean, players with the "default" role get an "upgrade" to "Iron".
Thats working.

But when my team reach the required onlinetime, they get the "Iron"-Rank and this rank is displayed.

Can i sort ranks with priority or something like this?

Displaying what rank is shown depends on many factors like if a group inherits from another one, if it has specific prefixes/suffixes set, what the weight is, etc.

We can't really give you a solution because we don't know your setup yet. Do you use tracks? Do the groups have weights? Does iron inherit from default or other groups? etc, etc, etc.

It sounds like tracks is what you're after.

https://github.com/lucko/LuckPerms/wiki/Tracks