Unfortunately, as an international student, your chances are low for most schools. You were previously rejected by all of the schools on your list. Why? You are asking for a full ride, and come from an overrepresented country. Now, as a transfer, your chances are even slimmer.
The pandemic affected the coffers of most of the schools, and they are watching their pennies even more so that before. You are asking for a full ride which doesn’t really exist.
You can try to apply to schools in the South and in the Midwest that may fund international students. Otherwise, stay and complete your education at DU.
(Your budget of $5k just begins to cover the health insurance fees, which are required by the universities.)