Solo Female - One Week in Europe

Hello!

I'm interested in taking a one week solo trip in September this year. I got divorced last year and while I'm doing pretty well, this is part of me regaining my confidence. I did travel quite a bit with my former husband and I was the one planning/in charge so I am a decently confident traveler, but I think divorce has a way of shaking that a bit.

Regardless, I've done quite a few local trips on my own in the last year and would love to try a week in Europe. In the past, I've been to Portugal, Spain, and Scotland. I loved all three, with Portugal (especially Lisbon) being a favorite, and Spain was many years ago as a teen with my grandma, but I remember really enjoying it. Scotland was beautiful but I would not say it settled into my soul.

I love good food, architecture and history, books, and nature. I love to log many miles walking, and would like this to be a trip where I can walk, sit at a cafe, go on a food tour, and feel relaxed and pleasantly busy. Safety is of course paramount, and I don't want to drive on this trip. I like having a home base and doing day trips.

I'm considering one of the following as a home base:

1. Lisbon (again), maybe with day trips I didn't do last time.
2. Seville or Granada.
3. Italy, perhaps Bologna or Florence.
4. France?
5. ??

Any ideas or insight? My brain keeps saying it's bad to repeat locations (Portugal, Spain) since I'm in my early thirties and should "see the world," but I am sure that's not the most healthy way to look at things! I'm not looking for a "change my life" experience, as our stuff definitely follows us, but want to rebuild my confidence doing something I deeply enjoy and hopefully feel recharged.