How to apply for somewhere not hiring?

Okay so at the start of July I started my apprenticeship, I’m 23 so it was hard to get due to my age and having to be paid more, anyways my new boss is completely unreliable and some weeks I’ve only been working 1-2 days a week which is shit for someone who wants to learn. I want to look at going to a new electrical company but due to covid I haven’t seen anyone hiring at all. What’s the best way to approach people who aren’t advertising?

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