The immediate remedy should be to find an affordable loan. Nevertheless, homing refinance usually has one-off prices of between $1,500 and $3,000. Also, you will need to go with the loan approval process again. Given your lower salary, you may not obtain such a new loan.
Your next choice is to raise your profit. Ideally your renter's lease shall expire, and you have a chance to renegotiate. But you can not depend on always being able to raise rental rates.
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