Roscoe is a trail bike. Trying to make it a hybrid like you would with a 30yo rigid MTB just isn’t going to end well. Another bike is a better idea.
That said, I find road bikes pretty interchangeable. Only a matter of how much you want to spend on better parts or a brand name. Gravel bikes much the same. And there’s some overlap, which is a good zone to be shopping in unless you are becoming an outright roadie or gravel racer.