first, you need to want to test yourself, i.e. believe the pandemic is real and be willing to make the effort to get tested.
I think if was free and easy, I do think more people would have done it
second, you have to be willing to do the right things if you test positive (quarantine).
I really think that most people, if they got a positive test, they would quarantine... even in maga country
now getting them to take the test...well again free and easy would be the incentive
Contact tracking would also go hand in hand with this result too
finally, tests aren't perfect and they're only a snapshot in time -
Of course, but if it was free and easy, people would test more