In order to believe that Trump won the election you have to believe; The electoral system in the USA is broken to the degree that fraud is widespread and pervasive and of sufficient magnitude to move an election. You have to believe that people as close to Trump as Mike Pence has become part of a conspiratorial network or have been shut down by people who are able to put sufficient pressure on him. You have to believe that the judiciary in the USA which have ruled 60 times against his claims and 1 time in his favour. You have to believe that it has become uncontrollably corrupt even on the republican side even when those republicans were nominated by trump or by his people And you have to believe that the only person standing on moral high ground through all of this has been Trump.
Its about 11 mins in https://www.youtube.com/watch?v=5eBcKlBaaoc&t=1924s
That is a fantastic summary of what happened.