2016 Lincoln MKZ - Battery drain

Battery drain overnight

Does your vehicle still have the original battery? It may be having trouble holding a charge. Have you had it tested? Are there any aftermarket accessories installed such as alarm systems? Are you keeping the fob a good distance from the vehicle when it’s not being driven? Sometimes a vehicle senses the fob and doesn’t completely “go to sleep.” The condition you describe could be what’s called a “parasitic draw” and those can be difficult to pinpoint.

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And, when you do Drive it are you driving enough to fully charge the battery.
With a fully charged battery, check for parasitic draw, then go from there.

With no info to go on, my first question would be is that the original battery that is still in it?