If you could not be claimed as dependent by someone else for 2020, you should file a tax return if for no other reason than to receive the Recovery Rebate Credit (assuming you did not already receive the stimulus payments). Based on your income, you probably don't have to file, but you won't receive the stimulus/Recovery Rebate Credit if you don't.
For your crypto mining, you won't have a taxable event, until you sell or transfer for value, any crypto.
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