I have a full time 9-5 job Mondays to Fridays, I only started uploading my comic 2 months ago, but I have a set schedule for myself and what needs to be done every week or every day depending. It's an art related job so it can be pretty draining on the creative side for me, so I have prepared a list of ideas on what I can draw and a backlog of several pages ahead of schedule, so I can properly prepare myself if I need to work overtime.
Remember to schedule in time to take breaks and take exercise for your body, esp your wrists if your work is art as well.
Also, you can try finding a workflow that is most efficient for you, don't worry if you are using assets like 3d that people seem to consider that as cheating. What people see is the result of your work, not the process.