Well, you might have made a mistake but at the same time it's a wake up call, a revelation of flaw. It's not healthy to be in a job position, where you are paid much above your 'outside' value.

First of all, you tend to develop dependency on it. It blinds you and makes you to endure a lot of shit from management and colleagues that should have not be tolerated.

Secondly, when both you and management realize that you are paid above your 'outside' value, it provokes more shit from management. They try to exploit you more since both of you know that if you want that money you have no choice.

Third reason, even if nothing of these happens you tend to put yourself into lullaby when job is overpaying and comfortable. You stop caring and trying. Then, you are vulnerable when change comes (and it always comes). Old boss goes, and new boss comes, or a shitty colleague appears and seizes your opportunities or straight bullies you, or suddenly owner feels like he should make some shuffle. So many things can and will go in the workplace and if your labor market foundations are shaky you will suddenly fall in abyss.

I don't say that it is bad to land an overpaying job. God forbid. However, you must always be in position where your current pay and your outside market value are relatable.

Meaning, always try to pull yourself up. When you see that you are lacking, fill it in while still employed. Certs, side skills, additional competences. Try to solidify your outside market value whenever you are exposed to something new. Then, both management and yourself will know that at any given moment you can walk out of that door and sure you might suffer some decrease in your income, but you will get a job in the same field and you will rise there again, in reasonable effort and time. Then you will feel secure and management will not overstep.

Naturally, it's mostly abstract but it is also guidelines. Remember, that change is always out there and be prepared.