Here we can't renew a US passport by mail any more, unfortunately. That is how I did it the last time in 2011. You have to go to the Embassy twice, once to apply and once to pick it up. I live outside the capital and it's about a 2 hour trip each way on public transit to the Embassy. Mine is still valid until September, I think. As a dual national, I only need a US passport to go to the US, though. A Chilean ID works for South America and a Chilean passport works anywhere else. I only need to show a US passport if I enter the US. My first priority is the ID and then a Chilean passport. That can be done at the Civil Registry in town, although it's apparently always crowded so I am going to wait a bit and see how the virus progresses. Soon we should start seeing if the vaccine being used here is having an effect or not.