I have not filed taxes since I quit my job more than 7 years ago but started buying and trading cryptocurrency in 2013. Many of these trades were done on coin-swapping sites and the associated information is not obtainable. The total value of what I held peaked at just over $200,000 at the end of 2017 but has since lost almost all value. What should I do?
What you should do is go to a local tax professional for help. The tax issues related to cryptocurrency are complex, and you have a serious failure-to-file problem. You need professional guidance and help.
See the recent IRS news release at the following link on the IRS web site.