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I have a MacBook air 13’’, Is there a way to replace the keyboard without having to replace the whole lower case? If so can you please direct me how to do so?

It comes down to difficulty, time and costs! If you’ve never replaced a Mac keyboard, you will likely prefer to replace the upper case which is the easiest way MacBook Air 13" (Mid 2013-2017) Upper Case with Keyboard at $110 USD its not a bad deal! It takes about 45 min’s to switch the upper cases out. If you’ve done a few keyboards or just want to give it a try you can just replace the keyboard alone. But I’ll warn you its not easy and you may not like the condition afterwards. MacBook Air A1369 or A1466 keyboard for $30 USD. But the hard part is getting the rivets out and then replacing them screws (50+) doing al of that without bending the upper case and the frame. It takes a good two hours of time for me to do one, it will likely take more time if you haven’t done it before. In either case you’ll need to follow this guide to get all of the parts out MacBook Air 13" Early 2017 Upper Case Replacement