Totally empathise with this.
For me flight simulator has been about learning new things, I’m a technical person and enjoy technical challenges so I’ve learnt how to fly the A32NX as in depth as I can (320 sim pilot on YouTube is an AMAZING resource for this, I think he talks things through in my language)
So I then use challenging flights and approaches to practice what I’ve learnt, be it landing the A320 in bad weather, or flying a SID or STAR using just the needles instead of the GPS in the TBM.
I am about to embark on learning the WT CJ4 which somehow I’ve managed to put off… I think because I’ve not yet found a YouTube resource like 320 sim pilot to teach me that plane.
Anyway not sure if any of this is up your street. I think it’s also easy to spend money on pay ware airports etc to make your flights more interesting, which is all well and good if you’ve got the disposable income.
Also for what it’s worth, as someone who enjoys IFR more than VFR, my Navigraph Subscription COMPLETELY changed my flight sim world and the way I fly and plan my flights.
I think the next thing I need to try VATsim again, because I think that will bring another huge challenge and element of community to it all - also amazing because it’s free!