Should I leave after 3 months?

Took a job in May with more time off but significant pay cut- sentimental reasons, won’t disclose to keep privacy. Job is completely not what was advertised, have almost nothing to do, bored out of my mind. Was contacted by a company in my former career area about a job with very defined duties that I know well, $15k more a year, and even more time off. Is there a reason I SHOULDNT change jobs? How awful will it look to have a 3 month job on my resume? For context, I’m not a spring chicken so I don’t have to worry a ton about looking bad in the future. I just feel like crap about all of this. And tbh a bit mad at being mislead.

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