$70k sounds like a huge amount, but keep in mind that the profit is only around $35k (due to CodeCanyon's fees) and spread over 5-6 years, so the average is around $5k-$7k/year.
Here is the (profit) breakdown by month, since 2017:
Some notes:
Most sales came from the CodeCanyon discovery and from organic traffic (since the switch to Gumroad).
Let me know if you have any questions about userTrack or those numbers!