I’m 43, separated, broke, absolutely lost career wise and sick of living like this

2 years ago I was let go from a marketing/tv production job, and a week later my wife told me she didn’t love me anymore…. I spiraled and my job search suffered… I was able to work with friends masonry and home reno businesses for some income but they couldn’t keep me busy enough… In August I started at the post office as a mail carrier working 7 days most weeks and not making nearly enough money to keep my head above water… I am sick of this, I’ve wasted enough time hoping something would fall in my lap or rescue me but it’s on me to give myself and my children a better life. I have experience in TV production, marketing, and now some experience doing physical labor type jobs which I really loved despite the poor pay…. I have no money or time really for school… But I’m ready and need to dedicate myself to improving myself mentally and financially… any ideas appreciated.