I understand it must be boring practicing a single movement or cut a thousand times, but that's how proficiency works. You do it enough so that it becomes second nature. Most people's time would be better spent drilling one skill/concept/ technique for a few days than if they bounced around to something different every practice or heaven forbid multiple times in a single practice.
If time is limited then make sure you have a clear idea of the things you are working on every time you go to fence and stick with them until a desirable level of proficiency has been reached before moving on.
HEMA at large is really lacking in foundational drills that teach core principles. I'll come out with a video demonstrating what I have worked out, but for now I'll leave these:
Winding (if you are ready, it is crucial you do these without jackets)
Level 1: Maintain blade contact, and fight for centerline control. This is a continuous flow drill. Don't stop trying to gain control over the center. The goal is not to land a hit, but simply to acquire and maintain positional advantage. Be sure to restrict your self to the four hangars. Don't rely on kron to defend against winds to the upper openings. You need to be keeping your point on your opponent at all times, so that means making use of those Upper Hangers when they threaten you up high. This is a critical weakness I see in most people.
Also be mindful of always being too hard or too soft in the bind. You need smooth transitions into both depending on what the other person is doing. Posture and structure are key secondary skills that will make or break you in this.
These drills are an excellent way to learn feeling, point control, body structure, while keeping the body limber and extended. Of course you now have a base with which to practice all the techniques that are performed from the bind (pulling, changing through, doubling, etc).
Strive for Excellence in all things, The Dread Knight