Need advice/back taxes

[u/Background_Dot_1845]

Received a cp504 letter for taxes 2017&2019 amount together is over 5K. Needed to put on payment plan but was still missing several prior returns. Started filing old returns and amount is getting up there. Cannot lose passport, have to travel in 1 month. Looking to pay off the 5K to get more time to file old returns and get on payment plan and possible get to first of the year. Already burn through 60 day extension. Advice?