Xbox has been continuously improving and I feel like they’re listening to the community very well, so before I go into any of the thing I’d like them to do better or differently, please continue to listen to the community. This builds so much confidence and loyalty in the brand, it’s amazing. Love it, keep up that work team at Xbox 
With that being said, here’s my two cents on what Xbox needs to improve.
1 - First Party Games. At the end of the day everything is going to come down to games with me. For me this means ensuring the games we love and that Xbox owns come out on a regular enough basis.
After acquiring Bethesda/Zenimax that means they need to figure out a way to deliver Elder Scrolls and Fallout games on a regular enough basis. That means supporting those studios with more staff, building more teams to work on multiple games, building a dedicated studio for one of those IP or potentially letting other internal studios develop one of those titles.
For XGS and Activision it means using their dormant IP. Activision also needs help freeing up their studios to work on those beloved IP.
2 - Eastern Content Support and Localization. Every first party game needs to have Japanese and Korean localization. Period. Growing a user base in Japan and South Korea is important and if Xbox’s first party doesn’t support that area, why would developers and gamers feel that Xbox is all in on supporting that region.
Investment in the area in terms of studios needs to happen too. Acquiring a several developers in Japan and South Korea is important for the region but also the content produced has popularity in the west, show both fanbases support.
Doing these should lead to increased confidence in what Xbox is committed to in the region and ultimately lead to less games skipping Xbox. Until then, pony up some money and pay to get the support or help them market it, whatever brings the games to Xbox.
3 - Marketing. Currently I see more marketing for the Halo TV show by Paramount than I ever have for Xbox in the past 5 years. That’s a problem. A big one.
Xbox isn’t in first place and they’ve got a subscription based service model. They need to be pervasive in all aspects of marketing, all over social media, sponsoring sporting events and soccer teams, buying up billboards and tons of TV ads, wrapping busses and trains in ads. They need WAY WAY more advertising. This should be one of Xbox’s largest expenditures.