$20k is not a lot of money and wont last long.
Job is part time but pays more than $20k per year so yeah would take under a year to earn that back but she can get another job so does this matter?
Basically paying $20k for a good job (but on paper) it seems?
Just do your job and Bitcoin in the side then I am sure that you will be fine financially.
If cant afford to take risk, i will suggest to stay with the current job and if possible also take that another Job as a part timer. It surely depends on the how much time you have, How much energy you posses. Obviously you cant work for 20 hrs a day and make yourself ill after a week. A balance is needed in all walks of life.
For me, I would choose for 20k paying. We all know that we need a stable income, but if you have been offered on your home with stable income or job, I would choose to work in my home. Obviously, you can work on your home, you can always be relax, no stress in your office work. If you would need to take a nap, you can. But we need a stable income, or job, we should have 20k plus job or earnings