Not trying to sound like an expert but we all struggle with , not attaining the skill level that we expect of ourselves. Here are some thoughts about practice.
You are excercising(training) your brain as much as your muscles, so rhythmically, it doesn't matter , too much what is under your stick. The idea, is to get your muscles toned and communicting with the brain as a unit. Practice strokes in your head----once your brain has them, your muscles will fall into line.
On-line lessons might be of some value but the problem with them ,though, is, there is no rapport. It's all technique ,so it is good for individual skills but not really as a set of lessons. I do like listening to Jim Chapin. He is great at breaking down , stick method.
None of the great drummers or any drummers of the past had the benefit of the internet. I can't see that it would have helped them much, really.
That said, some of them did take lessons and in today's world, those are expensive, so take note of the individual skill segments on the internet and practice them,---- even if in your head, only because that is at least half the battle. We all progress at different speeds in everything and there shouldn't be any expectations of performance on anybody,---relaxing about that is important.
There is something unique about playing kit drum when compared to playing most individual static percussion instruments. Each of those requires technique , unique to it and most of that technique does not require much Y movement( with a nod to mallet instruments etc.). Playing the snare drum for instance, requires a lot of X movement but in transiting from the snare drum to the floor tom , there is a lot of Y movement. That transit discombobulates the brain and so, also discombobulates the entire effort.. Brain practice is the key to moving around the kit with fluidity.