No, I've got a huge backlog of things I'd like to get done, so in principle I'll never run out. I do get times when I don't feel like doing much, but the work is always there as soon as I'm ready for it. I don't see that money has to be an issue. If a plan for getting something needs a lot of money, I can always look into ways of getting there more cheaply - in fact I've spent a lot of my life squeezing good results out of inexpensive materials and equipment, so it's second nature for me to look at how to do things on the cheap and I enjoy getting things for nothing. And I use computers a lot, and most of my programs are freeware. There's always more I can do with a computer, and I usually buy computers second hand so they're pretty cheap.
Even if I completely ran out of things to do, there would always be one remaining task - to find something interesting to do. That shouldn't be all that hard - I'd just take a look at my life and identify things about it that were annoying or worrying me, unsolved problems etc., and then pit my wits against them to figure out strategies for making things better.
I suppose I'm lucky that I have the sort of mind that's nearly always interested in that kind of thing. I don't really get depressed but sometimes I get phases where everything I've been working on has become bogged down, with no obvious ways of moving anything forward. But it's always passed eventually and I start to see possible methods for clearing the logjam, or maybe I'll just let the bogged-down stuff stay where it is and find something else that looks more likely to have a practicable solution.
I feel sorry for people I hear about who are lost when they retire, and I gather it's like that for a lot of people. I always wonder what it must be like to be only able to do anything if somebody tells them what to do and how to do it. I always resented that when I had a job, and much preferred to choose my own targets and my own methods, so when I retired I didn't feel lost or any less happy at all. Of course I'm happy enough to get ideas, inspiration and advice from other people, and I wouldn't want to be without that, but with the internet there's no shortage of those things.