The first fundamental tactical skill is to be able to hit consistent groundstrokes that go in.
The next fundamental skill is to be able to hit groundstrokes that land consistently deep.
If one is a backcourt player, being able to hit consistently deep, topspin(not extreme topspin, just topspin) groundstrokes should be the absolute top priority, and that sounds like where you need to get. You are at a point where "get it in" is no longer good enough.
Don't be fooled by watching the pros, where a lot of balls land around the service line. Those guys have extraordinary athleticism and defensive skills. Those are not weak shots from the necessarily, but at the rec level it is.
As a standard I would say this: Every ball lands beyond the service line and 50-75% land closer to the baseline than the service line(unless you are going short on purpose of course).
Now, if you are doing that, and these guys are consistently half volleying aggressively from the baseline, that is another, harder problem to solve.