If your gas oven doesn't heat up when you turn it on, the most likely culprit is a bad igniter.  Changing it out is relatively simple and far more inexpensive than purchasing a new range.  

This video uses:
Kenmore Oven model number: 362.71332200
Igniter part number: WB13K21

Like the magnetic work light? Here is a similar one:
https://amzn.to/3BIlZVA

Like my shirt?  Find it here on Amazon Prime:
https://amzn.to/399G19W