I would not redirect an unrelated domain. I don't think just buying expired domains and redirecting them for link juice is a great strategy.
It also depends on the domain name. If the domain is firstname-lastname.com then I'd just let it expire.
If it's generic like career-advice.com and you think it might have some value, then just try to sell it.
If you think you cannot sell it or it's worth <100$ then just let it expire and move on, like others already mentioned.
"Semper paratus!"
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