How important is it that you have a fulfilling day job? I see many replies about things outside of work being fulfilling, but doesn't work give you the freedom to have the time/money to do the things that give you substance?
Asking since I find some things I work on are very unfulfilling.
That's a personal question that you'd have to answer for yourself. Work doesn't give you time but it does give you money. Money can assist in providing you opportunities to do things that give you substance but it most definitely isn't the only tool that provides that opportunity.
If you would like your work to provide fulfillment you should look for other job opportunities. No harm from that.
If it isn't necessary then find work opportunities that allow you more freedom, such as, flexible schedule or working remotely.
Asking since I find some things I work on are very unfulfilling.