It's harsh, but when it comes down to it, you have two options:
1. Spend less
2. Make more
Usually spend less is the easier option in the short term (though if you're already living a very frugal lifestyle, there may not be much room left). In the long term, though, making more is the better bet. Obviously that's 1000% easier said than done, but if you're finding it difficult to cut back anymore, consider looking for another job, taking classes to boost your qualifications, taking on a side gig, etc.
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