My god, you lot are a depressing bunch at times!
I have a PhD and now a successful academic career, yet if I’d listened to some of you during the 1 1/2 years I was unemployed (5 years ago) I would’ve probably jumped off a bridge!
I advise the OP considers carefully his/her options. With a science PhD, you have demonstrated yourself to be highly skilled in a specialist technical area. Look for who/where/what will value that ability now and, further, evaluate closely what it is you actually want to do. Then make ‘you’ look like the person who has always wanted to do that – externally to people reading your CV. This may require some arm-bending to obtain a voluntary work placement in the area you want to be in. You now need to demonstrate commitment to a particular area and that you have your head screwed on.
Seek direct advise from professionals in the area you want to work in – on your CV and covering letter. Again – beg, plead, be nice. Get good advice from successful people – not ‘the Internet’.
Above all.. I’ve been there – and I know how it feels. Keep on at it – whatever direction you choose – and you will get there! 🙂