In the Reagan years the fixed mortgage interest rates (click here) were as high as 17%, never less than 10%, so don't blame the increasing interest rates on Biden.
Blame it on the steeply increasing inflation supported by the House of Representative that allow such disbursement of non-existing government dollars for imaginary programs dreamed up by the liberals allowed to hold office.
You ignore the horrible economic conditions inherited from the previous Democrat regime, making it necessary for Volker to jack up the rates to attack and then cure Carter’s stagflation.
It was tough medicine but it worked and helped produce one heck of a strong economy.