Trip to D.C. - help, please!

[Angela]

The stars aligned in my favor this week and I'm lucky to be able to visit Washington D.C. again from August 4th to 9th.

It will be my fourth visit and while I have done so much walking and sightseeing, I can't help but wonder about all the things that I might have missed.
Therefore I was wondering if the brilliant minds on this forum have a few places to direct me on all things Lincoln in the capital?

In the past, I have - of course - visited the Lincoln Memorial, the Capitol, the Portrait Gallery and the museum of American History. I tried Ford's but that did not go so well but I was impressed by Lincoln Park.
I have a recommendation to visit Fort Stevens and the Lincoln statue at Fort Lincoln Cemetery. And I - finally - scheduled a visit to Soldiers Home.

Since this is a rather spontaneous trip, I will not be able to visit the White House.

Is there anything else that anybody would recommend seeing?

Thank you very much in advance!