I'd suggest you sit down and reflect on what you'd like to try next. Easier said than done? Just before I retired I completed Zelinski's Get-A-Life Tree exercise. It didn't take that long once I focused and it was very helpful, gave me that final confidence to retire. And I have used it to build my next chapter. Zelinski's challenge is to come up with 50 branches off the four main branches (see below).
I highly recommend the exercise, you can get the details in Zelinski's book (The Joy Of Not Working) at your library - it's only about 6 pages to read, and there's a list that will help you think about possibilities.
And finally FWIW. DW and I have had dogs, two at a time, our entire married life. The last one passed away a few years ago, and we've consciously been without to enable travel and boating. But I think we know we're happier with dogs in our lives, and the trade hasn't been worth it for us. I think we need dogs in our lives to be happier.