A couple of ideas for you:
In 2016, I spent a week alone in Todi and loved it. I had an apartment at the bottom of the town, would walk up to the top to find a place for dinner, and as I would stroll down the old ramparts, families of all ages would just be walking up for their dinner after 9:00 pm. It's big enough to have lots to do and see, not so big that you can't do it all. From Todi, I did day trips to Spello, Amelia, Deruta, Bevagna, Orvieto, Carsulae (Roman ruins, not a town) and a few others I'd have to look up. All were wonderful. I never made it to Assisi.
The next week we rented a gorgeous villa in San Gemini, also a beautiful but smaller town. Maybe worth a drop-in, just because it's very back-door. We had a killer dinner in an old stone restaurant with a huge open fireplace full of grilling meats. That week, I took my friends back to Orvieto, which was one of our favourite days that week. A second trip to Carsulae was also a hit with my friends. It was once a bustling Roman market town, then lost for centuries. There's rarely anyone on the site except archeologists but it's great to wander through. One friend and I made the trek to Civita di Bagnoregio another day. I found it interesting but a bit eerie with no town life beyond tourists and those who provide services to them. I wouldn't go back.
Today, Elizabeth Minchilli posted on Facebook about a new place in Umbria she'd never been - Rasiglia - and it looks amazing. If you have Facebook, look up her post. The photography was incredible. It's on my list now.
As far as wineries, I'd strongly recommend a van tour with Gusto Wine Tours. We had a wonderful day out with Mark doing the driving and story-telling, to small wineries he had found, and a fabulous private lunch. I'd do it again in a minute, their tours are very well run, lots of fun, and he is so informative. (No connection other than a customer in 2016)