I enjoy the feeling of accomplishment and pride that I get from turning a blank canvas into a piece of artistic storytelling that I dreamed up in my head and brought to life with my hands. I get major euphoria looking back over my previous pages and seeing how much I accomplished with my bare hands. It's just so cool!! While making the comic I enjoy seeing my characters interact with each other and get frazzled by one another as they get to know each other. I like drawing bonds growing and intimacy, so those scenes are always a treat to play out.
Making a long-form comic (or even gag strips that you will update regularly until who knows) makes me think of a marriage or contractual obligation if I'm not feeling romantic, but it's one I willingly accepted and didn't take lightly, much like my marriage, bc it truly is a long term commitment that will have ups and downs. Now unlike marriage, I don't think most of us want to be working on the same comic our whole lives (some do and that's cool too.) but being committed to something as time-consuming and often underappreciated as webcomics will truly test you. Like marriage though, if things aren't working out, sometimes you gotta try a separation. You may come back ready to try anew, or decide this ain't for me and make the split permanently.
Anywho, I feel you though. When I feel exasperated or have the urge to work on something else when it's my comic-making season, I just do (even if it's in small spurts when I can squeeze in some downtime on break at work). I try to make sure to have a backlog going if this urge happens before my scheduled break times and it will require more time than just a passing fancy would, but sometimes you gotta step away and refresh yourself on another activity or project and then come back with your vigor for comics bottle filled up and ready to go. If you are on a tight schedule though, this can be harder, but I'm a fan of every little bit counts. So even if you got pages you want to get done, you can still work on something else on the side that you are drawn towards, even if it's just a few minutes a day.
I stay in the mindset of we only have this life as we know it, so make sure to spend it doing things that bring you fulfillment and joy when you have the opportunity to. 