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I had the same issue. I mined early on. I had just over 3 bitcoin and just lost interest in it. Now I too do not remember the wallet keys to access those funds.

Have you tried Coinbase wallet? I've had them for 2 years + and no issues whatsoever. I feel safe with Coinbase.com wallet:)))) Cheers!

I don't have one yet but I will once I start trading crypto.