Ah, very nice to see another Bowie fan here! Life On Mars is one of my favourite songs. And I also love the other songs/albums you mentioned.A genre I have found myself venturing into a lot recently is early alternative. It really amazes me how much influence artists like Lou Reed have had over the years, and I personally believe reed to be the most underrated musician of all time. I have friends who are not really fans of alternative who say that these songs are very acceptable, and I'd agree with that assessment tbh. some good examples are Pale Blue Eyes by the Velvet Underground, Perfect Day - Lou Reed, Life On Mars - David Bowie (dodgy whether that's alternative though), Oh Sweet Nuthin' - The Velvet Undeground and Lust for Life -Iggy Pop are all incredibly enjoyable to listen to in my opinion. If you're the type of person who prefers to listen to albums rather than individual songs, I'd recommend Loaded - The Velvet Underground and Transformer - Lou Reed as very good and very accessible early alternative albums. Transformer probably features all the best known alternative of the time, such as Satellite of Love and Take a Walk on the Wild Side.
Aladdin Sane is one of my favourite albums ever. But yeah, I love all Bowie albums, aside from the commercialist Let's Dance era.