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I think you really need to see what could gain you more capital in the short-term. It seems that you have worked in the decorative arts before so I think that investing in a better camera in order to make more money is a good start. Once you are able to save more money (at least 15K), you can use some of that to rent studio space and start developing new performance work. This way, you still have a way to make constant money and you have some money saved. It seems to me that the photography is a safer investment but not necessarily what you really want to do while the studio set is a much riskier endeavor but also something that seems that you really would like to do.
Thus, I suggest investing in what can garner you more funds short-term and save for the long-term. Once you have some money saved, then you can invest in what your dream job would be. In addition, you will be able to spend more time with your mom and have less stress since photography shouldn't create as much risk and stress as setting up a studio and hoping it gains momentum.
I do think that eventually you should pursue performance as you have in the past and develop it further. However, I think you need financial stability short-term and you need to have more to invest in performance as I feel it will take a lot more investment in the beginning before it is profitable. Photography can prove to give you stable work when needed as well as a fallback.
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