The IRS reports statistics on its filing season (https://www.irs.gov/newsroom/filing-season-statistics-for-week-ending-july-24-2020). Through July 24, 2020, 152,875 income tax returns were filed for individuals, compared with 146,342,000 through July 27, 2019. Of these returns, there was a 23% increase in self-prepared returns filed electronically.
The number of refunds, however, fell 3.1% as compared with last year. The average refund from 2019 returns filed in 2020 was $2,741, the same average refund issued last year.
On Form 1040X, you may file an amended return within a three-year period to claim a refund or correct a mistake made on an original or previously amended return.