Shift linkage or transmission needs mechanical attention.
Your post was unclear: does "N" give you neutral . . . basically, does everything line up and work correctly except reverse? If shift linkage has no issues, then cheap/easy is most likely not the answer. Mileage of Jeep, service history, and any other pertinent information would help us to guess less wildly.
PLEASE BUY AMERICAN SO I DON'T HAVE TO LEARN CHINESE
The 4th little pig made his house of reinforced concrete, with wolfskin rugs in every room
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