In order to ‘master’ one first must record, no?
I know he was asking for advice using audacity. Just wanted to open up another view on how to master.
You can record your mix as is (macro) and tweak levels and eqs or you can capture your flow (micro) and tweak eqs, levels and the like on everything individually.
A good example of micro,
You recorded your mix already and wish you could of dropped the bass of outgoing track earlier. Maybe it might of happened a few times during your recording. Wouldn’t you like to know that there is a way to go back fix it?
At the end a good recording will give you a good master. That’s my advice for the op.