There's nothing you can really do at this point in time since 2020 is over. You are not able to use 2021 losses to offset 2020 gains. This happened to a lot of people who began day trading for the first time during the dot-com bubble.
You can check to see whether all your transactions are being reported correctly.
If you have a tax penalty you can try to annualize your income if most of your gains took place towards the end of the year.
The IRS also has payment plans.
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