Although Mahler was truly a very great composer I never listen to him any more.
In my twenties and thirties I listened to Mahler a lot, I can still conjure up quite large sections of the Resurrection Symphony in my imagination for example. However I don't listen Mahler these days.
I've sort of had my fill of the late romantic composers.
I listen now to all that came after the late romantic period (20 century) and all that came before it.
I like smaller orchestras and chamber music and in particular I avoid music which has the vast emotional and psychological ambitions of the late romantic composers.