I've been there with drawing plateaus, and what helped me break through was shifting from mindless sketching to targeted practice. Instead of just drawing whatever, pick one skill to focus on each session, like gesture drawing for 30 minutes using quickposes.com for timed references. That site lets you set sessions to match your time, and it forced me to capture movement better, which made my figures less stiff after a couple weeks.
Another thing is analyzing your work critically. After a sketch, compare it to a pro's version of the same subject, say a Disney animator's gesture, and note what's different in line quality or proportions. I did this with my tablet by layering my drawing over a reference in a simple app like Procreate, highlighting mismatches. Sharing a space with a roommate might limit privacy, but you could do quiet reviews during off-hours. Over time, this built my eye for improvement without needing hours daily.
Finally, mix in variety to keep it fresh, like one day on hands from photos, another on shading techniques. I committed to two focused hours a week plus daily 30s, and saw real progress in a month. If energy's low, start with what excites you to build momentum.
