There is a method of recirculating the hot water to keep it hot at the shower or faucet. It is slightly different depending if you have a tank or tankless heater.
If you are a DIY type google Hot Water Recirculating, it is not hard. If you are not a DIY type, any good plumber can do it for a few hundred dollars (just a guess, I did my own and it was around $300 total and an hour or two).
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