When you left academia, you need to stay in touch with academia and recent research. If you can publish from time to time, it should be enough to demonstrate a potential employer that your are capable to research on your own.
I assume you apply to open positions. There you won't do your own research, but follow the ideas of a PI, do work which was promised for grant money, or help with the problem of your new colleagues.

You should clarify what your strategy is to get back to academia. I suspect that your actual problem are your unsuccessful applications. Probably you have to post a new question addressing this issue.

When you leave academia, you need to stay in touch with academia and perform up-to-date research. If you can publish from time to time, it should be enough to demonstrate a potential employer that your are capable to research on your own.
I assume you apply to open positions. There you won't do your own research, but follow the ideas of a PI, do work which was promised for grant money, or help with the problem of your new colleagues.

You should clarify what your strategy is to get back to academia. I suspect that your actual problem are your unsuccessful applications. Probably you have to post a new question addressing this issue.