Is it okay for a sole breadwinner approaching 40 to move back to his hometown? (Long post warning)

I am a sole breadwinner approaching my 40s with an elementary school-aged child.
I used to work for a large corporation with a generous salary, but I resigned due to extreme stress that lasted for several years.
Since I didn't know what to do after quitting, I've been working part-time jobs for the first time in my life (kitchen work). I work 6 days a week, and while it was hard to adjust at first, I've found that physical labor has its own charm once you get used to it.
I never knew that not having to think about work after getting off the clock could feel this good. I am currently earning about 3 million KRW a month. While working, I have completely stopped taking the psychiatric medication I had been on.
This might be a bit embarrassing to admit, but since getting married, I have been receiving living expense support from my parents, which is how I was able to support my family even with that amount of income.
Still, working in the kitchen has given me some confidence that I can do anything if I put my mind to it.
I've been thinking about how to live moving forward.
I plan to convert our house in the metropolitan area into a semi-chartered rental (monthly rent) and move back to my hometown (a metropolitan city) using the deposit to live in a Jeonse (lump-sum deposit) rental.
Since my parents have agreed to help with childcare, dual income is possible.
If so, the income would be..
1. Monthly rent income: +1.5 million KRW
2. Dividend covered call setup: +1 million KRW (based on 200 million KRW; will skip if unnecessary)
3. Parental support: +2.5 million KRW (for now...)
___ (This covers living expenses) _____
4. Dual income 1 (Me): +???
5. Dual income 2 (Wife): +???
My goal is to become self-sufficient without parental support.
To achieve that, I think we need to earn about 3 million KRW combined as a couple. I don't know what I'll do once I move down there, but I have a vague feeling that I can earn at least that much regardless of what I do.
My wife is a former nurse (RN), so she has the will to work and will likely find employment more easily than I will. As for me, I no longer have much desire for office work; I want to move down, try various jobs, and find something that suits my aptitude so I can work with peace of mind without obsessing over the exact salary amount.
I have thought about this from many angles,
but I feel more secure if we increase our various sources of income... so I am planning to move while considering our child's school schedule.
My parents told me, "We fought tooth and nail in our time, but if you think that will make you happy, discuss it with your spouse and decide."
Then today, a former boss from my old company reached out to check in. I talked about my future plans—not in such specific detail, but vaguely—and he told me not to talk nonsense and that I should stay in Seoul and focus on changing jobs. He said it was absolutely impossible, or offered to try and find a spot for me at a company he knows. Even though what others think doesn't matter and it's my life to execute, being harshly criticized like that makes me feel a bit down.
I don't have big ambitions; I just want to live with peace of mind..