Hi, Shira.
I am a woman who travels alone and on tours, mostly RS tours. What seems to work for me is to go solo either pre or post tour (or both) to places I may have visited before and where I already have a certain comfort level - often determined by language. I find I put a lot of energy and passion into planning my solo travels - and I enjoy them immensely and have truly had some wonderful adventures. If and when a tour is appended to solo travel, by the time the tour rolls around, it can feel like the "vacation" is truly beginning. I can kick back, hotels and transport already planned by someone else, and I can relax a bit more. On RS tours, there are also many opportunities for alone time.
Regardless of location, I usually have some personal agenda like viewing a cattle parade in Tirol, or finding film locations for Roman Holiday in Rome. Lately, I have been searching for and locating starting points for the Way of St. James in different European locations. This spring, I am thinking of combining a visit to bluebell woods in the UK with the RS Heart of Italy tour. It makes me happy.
Another thing that works for me is not sharing a room with someone I do not know, which ensures needed downtime.
So, maybe consider a combination of visiting somewhere you are longing to return to on your own and joining a group for awhile? BTW, the My Way Tours provide even less structure than the guided tours, though in my experience, our group bonded just as well or better than a guided tour group. Age: there are all ages on tours. If you really want to ensure a combination, consider one of the Family Tours. There are single supplements available for these; singles can join them.
I have not taken any women-only tours, though Wander Woman (a tour group) and Journey Woman (a website) have been on my radar for years. Google women and travel and you will find lots to keep you busy.
I hope you find an enjoyable way forward. Debbie