There's no doubting that hard wiring is the best way to go - I agree with Martin. If you can manage it, definitely go that way. Just get yourself an RJ45 crimping tool, and a small bag of RJ45 pass through connectors (pass through makes the job very easy IMO) and a spool of CAT5 / CAT6.
However, if you can't manage that then WiFi is going to be your next stop. You might need a high gain antenna for the obsie for the range you're considering. I have a Wavlink AC1200 here and it provides a stronger signal than any other piece of networking gear in the house. I have mine downstairs, hardwired to the router through the walls etc upstairs. I'm not sure how stable it would be as a strict WiFi only repeater, but in the configuration that I have it in, it's as solid as a rock and has been going for about a year so far.
Others here might be able to assist regarding whether the distance you need to cover would be doable via WiFi. You might need a directional antenna / point to point style setup to manage it.
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