I feel for you, I have two friends in the same situation where they cannot even get interviews for jobs we all know they can do with their hands behind their back - because for 20 years, they have been very successful in those careers. And they’re in two different sectors, which shows how tough it is out there.
They are feeling the same loss of identity, loss of purpose, loss of ‘usefulness’, loss of control, loss of confidence. I see how much it affects them as we join together in utter disbelief that they’re still out of work.
So I really feel for you. I wonder if some career coaching would be helpful as I know some good ones who help unpack experiences around toxic jobs, crises of confidence after redundancy etc. something that would help you move on from ‘why it happened’ and stop beating yourself up over it.
Because you can’t change it. You need to find a way to stop going over it and move forward.
I don’t know why you lost the job (and I’m not asking you to say). But whatever the reason - redundancy, they let you go before probation, they deemed you not to be performing, it just wasn’t the right fit - this is a blip. You have many more years of success behind you than this one-off blip.
I trust you are registered with relevant recruiters for your sector who can promote you to would-be employers. I hope you are using your LinkedIn network and asking people to share roles with you when they see them. I see you’ve tried for other roles at your old place but have you reached out individually to the hiring manager? The recruitment algorithms are horrendous and might filter you out as ‘too senior’ before anyone actually puts eyes on your application.
Good luck. Keep going.