I have a simple (actually, simplistic and facetious) answer to why you are not enjoying platformers and CRPGs any longer: Platformers are 95% about how tight the controls are, the rest being meaningless fluff. Unfortunately, platformer gameplay is relatively shallow compared to many other gaming experiences, so a good platformer is just perfecting a plain butter and cheese sandwich when you could be trying new greens and spices or even a completely different dish.. Pixel platformers are the hipster trash of indie game development.

CRPGs are massively overrated simply for telling stories at all, nevermind that the vast majority of these stories are just high fantasy tropes piled on top of each other. Then you have trilogies like Mass Effect telling the worst sci-fi story since The Matrix but people only seemed to understand this when they saw the ending. No, just, no, the story was spectacularly stupid and full of holes from start to finish, you were distracted by the much more interesting side characters who actually had plots and emotionally engaging stuff going on. Most CRPGS are garbage hailed as mature and intelligent experiences simply for having a story, nevermind if they lack plot, internal consistency and originality.

And this is coming from a fan who has invested hundreds of hours in individual platformers and CRPGs, including Mass Effect. I am a master at head canon'ing broken game stories.

Here is my tip for where you should go from here: Play games with clear resolutions and "completion" in under 4 hours. Better yet, play any games that can give you a FULL experience in less than two hours. Faster Than Light and Papers, Please are great examples of modern games that keep you intensely engaged for a couple of hours and offer constant rewards, carrots and tension. Every minute becomes an emergent story far better than what some flat pixel platformer character with an ironic hipster douchebag name or yet another orc-slaying elf can give you once every two hours with no rewarding end in sight.

There are what I call action-platformers and exploration-platformers.
Action-platfomers are about getting in the flow in my opinion. I can't explain much more than that. I can add that the legacy of these lies in 3D arena-fps.

Exploration-platformers are about, well, finding hidden stuff and "collecting stars".

For instance the first marios were very actionny, the later ones more onto exploration. I am not saying there is a hard line between the two kinds (Super Metroid do both very well).
Many modern good platformers (Guacamelee, Shuggy,...) allow you to challenge yourself. Those game can be about completion as they can be about playing better, faster ....

I didn't talk about puzzles because every platformers may have some. Sometimes they break the flow, sometimes they don't.