As is often the case in business, you make your own luck. You could list the domains and sit back and wait / hope for an end user, and you may be lucky. Of course, the more domains you have, the more places you list them and the more relevant they are to a larger market, the better your prospects.
Even better, you invest the time and effort to engage in outreach to potential buyers. A few interested parties and you have leverage to negotiate. But even if buyers are genuinely interested, it doesn't mean they can afford a domain, or the domain makes business sense to them. In the past I've written physical letters to companies identified through Companies House, emailed similar or relevant websites, and reached out on LinkedIn.
Or you accept lower margins but a faster turnover by selling low and bulk. But those in the industry will still only purchase when they see value.
My biggest sale (mid £xx,xxx) was very lucky, I had a great domain which I had acquired off-market at a reasonable cost (low-mid £x,xxx), and the perfect buyer subsequently approached me for it 4 years later as it was very relevant to his small but quickly growing business. But this does not happen often! Though I've made a good return on domains in the past 20 years, this is very much a side gig for me and most sales tend to 3-5x profit after holding my domains 5+ years. It's not a get rich quick business, but I see it as a good 'and strategy'.
I caveat this by saying that there are some people who do exceptionally well out of domain names. But if you don't have the resources to invest, outreach, or missed the early-adopter advantage, then you're going to have to work harder for a return, whilst possibly enjoying the occasional spell of luck!
