Good effort, that's a decent shape to be in. 10k runs are my "thing" but as my march into middle age progresses, I find I can't do them back-to-back any more, I'm needing more than a day or two to recover.
Maybe go for something a little more varied - I'm training for (but never done) local triathlons. Great way to build physical fitness with only a third of the high impact on the joints. The major limiting factor will be the pool of course, unless you're fortunate to own (or have unrestricted access to) a pool.
Random turn of conversation direction, are you creative at all? Crocheting seems to make the world go by at an alarming rate - it's both a time killer and very rewarding.
Coffee shops are fantastic. My other half doesn't get why I go out to buy a coffee that I could easily make in the house for next to fuck all, but it was never about the coffee - it was about being out of the house and watching the world go by. There's a coffee shop in a hotel that overlooks the thoroughfare between one of my local city's biggest shopping centres and it's rail station, and it's nice just wasting an hour or two watching people go about their lives.
The cost of the coffee is just a warmth and comfort tax really for sitting there.