Your OP suggests you are ready to change circumstances. They were right for you while DC were younger, they aren't now. But for circumstances to change, you'll need to alter how you think about men and your chances of meeting someone.
I think mindset has a huge impact on how our lives develop. The two beliefs I would challenge if I were in your situation are: 'I am worried it will never happen again for me' and 'I don't trust men.' Work on changing that to, 'I have faith it will happen, now I am ready,' and 'I don't have to trust all men, but I am willing to trust a good man.' Then work out what you want from a man - what are the absolute essentials - and what you refuse to tolerate.
When you are really clear in your mind that it can happen and that you are ready to meet a good man, get yourself out there. Maybe OLD - with caution, as there seem to be so many chancers there just looking for sex. Just start doing things that matter to do so you meet like-minded men. That could be fitness - running, swimming, weights, yoga; campaigning for something you care about; studying for a new skill; performing music, dance or drama, making art or craft. Every single person I know who found love later in life met their man while pursuing some interest they were passionate about. I know later life romances that have flourished, which began in an orchestra, a choir, at a dance retreat, at a creative writing workshop, a photography class, and some at work in vocational jobs.
You say DC don't get out in the evenings. But that doesn;t mean you need to stay in every night if they are teens. One evening commitment a week, and maybe one at weekends is perfectly acceptable, and might encourage them to do more too.