The Foundation Trilogy went a bit further. Ultimately Asimov combined the Robot series into it.
I did not read the last book that Isaac wrote, but I have it around here somewhere.
I saw Asimov speak once at Suffolk University in Boston. He was quite affable. Funny though, he sounded foolish to me when he expressed certain notions. I was about 20 and he was likely approaching 70.
I like his books more than I liked his appearance that day.
I saw an interview with him years and years ago. He didn’t present as the person I expected. I read the last Foundation books that he added. They were not up to the trilogy standards. I had read later that he wrote them to fund a new marriage.