A room, not a chatbot.

Dreading Mondays at 38 isn't a mood, it's a structural signal, and structural problems don't respond to title changes. The promotion moves you up the same structure that's producing the dread. So get diagnostic before you decide: which part of the week do you actually dread? The work, the people, or who you're becoming there? Leaving might fix those. But only if you know what you're walking toward.

You're allowed to want out, and the promotion won't quiet that; it's the same job with better furniture. But wanting out isn't a plan. Before you touch your notice, write the founder sentence: I'm building ___, for ___, because ___.

• Blanks fill fast? You've been ready a while. Start scoping runway.
• They don't? Keep the salary and spend ninety evenings filling them.

You're asking which direction; I'd ask a prior question: what kind of person does each path make you over ten years? We become what we repeatedly do, and the promotion is more of the same doing. Ten more years of dreaded Mondays is practice at overriding your own judgment. Neither path is safe. Choose the one whose daily habits you'd be proud to have become.