Last I looked (about a year ago,) IBM is 3 things: Software licensing, services and Big Iron. The companies' revenue is split roughly equally among these three areas.
An interesting perspective of IBM is its relative position. It's leveled off at about $60b/y, after a lengthy decline. It is far overmatched by many big tech companies today in terms of revenue.
It's a niche business, serving niche demands. I think IBM's moat is that most of its business is highly uninteresting: industrialized box ticking work, deeply entangled by contracts and a strong need for continuity by its customers.
I actually had a recent encounter with one of IBM's products. A commercial B2B REST API I created was analyzed by an IBM vulnerability scanning platform on behalf of a major US municipality. It didn't find anything actually critical, but there were some worthwhile points in the report, and working around a false positive was a frustration. The product, in this case, is diffusion of responsibility.
On the Big Iron end, IBM isn't really selling hardware. They selling an ecosystem: services, software, support, continuity (over decades,) etc. It pleases me that they chose to stick to Power: it's nice to know Itanium didn't kill off every enterprise RISC platform.
Maybe, one day, some major quantum computing breakthrough happens at IBM. As far as I can see, that's the only play they have that could change their trajectory. In the meantime, they have a large software portfolio and plenty of institutions that will keep signing contracts long after I'm gone.