If you look back on the one-term Presidents during the last 40 years you can see that they were voted out of office because of what they did or didn't do during their first Term.
President Carter didn't win a second term because of the Iran Crisis.
President Ford didn't win a second term because of his pardon for President Nixon.
President Bush (the elder Bush) didn't win a second term because of the economy. His promise to not raise taxes rankle his base and the American people when taxes were raised.
President Trump didn't win a second term because of the way he handle the Pandemic.
None of these presidents with the exception of Donald J. Trump believed that there was fraud in the election process to cause them to lose.

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2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD