So, I didn't realize that I have to declare crypto conversions.
In 2019, I didn't sell or buy anything but converted a crypto currency from one to another.
also received some coins worth $10 but didn't sell them. (sold them in 2020, which I am declaring now).
So only transaction I assume needed to mention was conversion from one currency to another.
I have generated my IRS 8949 & IRS Schedule D (1040) for 2019, and for this transaction, I have long term capital loss of -$145.95.
How can I correct it? do I have amend the last year(2019) forms? or can I just submit the individual forms?shall I even declare them? or is it okay since it is capital loss?
You're required to report all your crypto transactions. However, since you had a loss, reporting that will not increase your tax liability for 2019, it could potentially reduce it. In that case, there is no requirement to amend your 2019 tax return. You can do it, but you don't have to. Unfortunately, there is no option just to send an additional form to avoid amending your return.
I've recommend you to keep records of all your cryptocurrency transactions for at least 3 years, because the IRS could change the reporting requirements, that area of tax law is still under development.