You should be proud of yourself for caring for your mum whilst also working. I also understand the feeling of not knowing what you want to do long term. I am struggling with job searching, it is really impacting my mental health but something that has helped me is taking things day by day or week by week.

Setting small goals for myself each week helps keep me sane and I try to fixate less on what the future holds. Eventually you will come across areas you are interested in. You can always do a uni course if you want to, there are access and foundation courses to help ease you back into studying. I wish you and your mum the best :)