He's determined alright but not for the reasons you think. Not only is he incapable of admitting defeat because he can't stand to seen to be a loser, he knows the moment he is out of the WH he faces state civil and criminal charges and the banks calling in his loans.
I listened to the entire one hour conversation and Trump multiple times bullied, insulted, pressured and threatened both Raffensperger and his lawyer, insisting he won Georgia and telling him he wants to find 11,780 votes - one more than what he lost by - and that Raffensperger can recalculate the counts and by doing so he would gain respect back from Georgia voters, etc. Even Trump's lawyer during the call crossed the line offering up advice and opinions of what could be done and as such, may face conspiracy charges.
As former DOJ, Inspector General, Michael Bromwich stated: "Unless there are portions of the tape that somehow negate criminal intent ...Trump's best defense is insanity" There weren't. The entire call was about trying to get the SOS to overturn the Georgia election.