It can be hard to maintain motivation and energy when shooting solo.
First of all, I'm curious as to what your goals are for shooting by yourself. Are you doing it to develop your craft, portfolio, or both? What helped me was to find meaning in what I was doing, a concrete goal that I could reach through continuing personal exercises. Once I decided I wanted to focus on developing my craft to develop a portfolio for graduate school AND be prepared to shoot a feature if that didn't work out, there seemed to be a reason and a purpose for making films on my own that took the place of the inspirational void, so to speak, that can sometimes arise when trying to push yourself in your art and craft on your own.
If you want to do narrative stuff, try telling a story. This seems obvious. But telling a story through shorts took me about six tries before my finished projects even had the semblance of narrative. I would make shorts titled "P Eats Breakfast" and "P Goes Shopping" and would try and see if I could tell a story through filming myself doing the most basic of tasks, and editing the footage into something coherent and interesting.
Once I got past that, I had an idea of simple stuff I could make, based on what I could do with the camera and in the editing. I filmed myself "teleporting" around the living room through jump cuts and through a series of dissolves.
I also let filmmaking techniques inspire my exercises. Do you know what 3/4 shots, high-angle shots, and low-angle shots are? You get a better idea of what these shots communicate and how to use them if you film them yourself. Grab a tripod, and do exactly that. You could even try and edit the series of shots to communicate something about your subject, whatever that may be.
As a fellow lone wolf, I totally get it. Continue to shout out if you need motivation. You've already shown your dedication by reaching out to ask for help when you needed it.