I'm not new to Xbox, I bought the original Xbox around the launch window, bought a 360 in the first year (a had 60 titles for it!), and have had an Xbox One for years. However, this current gen I probably only played a few Halo titles and used the system for 4K blurays. I've affectively left the brand/ecosystem the last 5-6 years. Long story short, I was turned off with the exclusives MS was pushing (major series fatigue with Halo and Gears), while Sony and Nintendo kept pumping out stuff I cared for.
Howeverrrr, I'm pretty much back. Sony is bungling a lot of the PS5 launch stuff and it's turning me off. Reminding me a bit of Sony during the PS3 era. At the same time Microsoft is doing something very compelling with GamePass and Backwards compatibility. Those are huge features for me and I already went and got my 3 years of GamePass loaded up. I wasn't able to get an Xbox Series X preorder which bummed me out, but there really isn't anything new to play at launch there. I love the idea of the stronger hardware as well and all the positive first impressions.
edit - and I didn't even mention the Zenimax deal, that's what instigated my interest in the Xbox again. I love old Bethesda games (Morrowind, Fallout 3, etc), and even though I don't have the biggest amount of faith in their new stuff, I absolutely want to play them.