Sometimes we win... Newest National Park

Well for us it's easier to list the parks we haven't been too and are obtainable for us:
Congaree
Cuyhoga Valley
Denali
Glacier Bay
Hot Springs (been to the town but not the park)
Indianna Dunes
Isle Royale
Katmai
Kenai Fjords
North Cascades (this summer)
Shenandoah (we have driven the Skyline as part of the Blue Ridge)
Voyageurs (like Isle Royale not sure if we are able to paddle this)

So we need 12 for our list to be filled 8 in the lower 48. Some of the Alaskan parks I'm not sure about and need to research more, at least 2 are doubtful. Maybe Alaska in 2021.

We've been to 44 National Monuments and would like to visit another 30 or so. Some of the historical stuff has zero interest to us but we would probably stop is we were close and had time. Others are located in parts of the country we probably are not going to spend a lot of time in Cali and the NE because of the unfriendly political environment and elevated prices.

Nevada is on our to-do list and next cool season maybe the time since we will be full timing. We would pick up a number of NM there.