Your old enthusiasm does not obligate you to enjoy the same thing forever.

Interests are not contracts, though a long-held one can start to feel like one. You built an identity around it, other people know you for it, you own the equipment, and quitting seems to insult the years you already spent. So you keep going out of loyalty to a former version of yourself who is no longer here to be disappointed. Enjoying something once does not commit you to enjoying it always.

Ask whether you would choose this today if you were starting from nothing. If the answer is no, you are allowed to set it down without a verdict on whether it was ever worthwhile.