Wrong. We have an idea of what Trump wanted done, from the peace deal his administration signed with the Taliban in February of 2020. The Trump administration's agreement called for the United States to reduce its forces to 8,600 from 13,000 over the following three to four months, with the remaining U.S. forces withdrawing by no later than May 1, 2021. Biden extended this date to September 1, 2021.
Trump's negotiated agreement included very few concessions from the Taliban. Although the agreement bound the Taliban to halt attacks on U.S. and coalition forces, it did not explicitly require them to expel al-Qaeda from Afghanistan or to stop attacks on the Afghan military. The Trump administration's agreement provided legitimacy to the Taliban, whose leaders met with Secretary of State, Mike Pompeo.
Now, the Biden administration could have, and should have, nullified this agreement. I'm not for one second, defending the clumsy and hastily organized exodus orchestrated by Biden. I agree that Joe Biden, and his Secretary of State Blinken, do own this mess, for sure... but it is inaccurate for you to say that "we have no idea what strategy Trump would have engaged". The Trump strategy was outlined in that peace agreement, and it wasn't much different than Biden's.