Yes and No. You may still compete in amateur divisions at A, B, and C Tier events if your player rating falls within the PROS PLAYING AM guidelines here: https://www.pdga.com/pdga-documents/tour-documents/divisions-ratings-and-points-factors. However, you are now classified as a Professional with the PDGA and are ineligible to compete in Amateur Majors such as the US Amateur Disc Golf Championship and Am Worlds.

All rated rounds you have played and have been reported to the PDGA within 12 months of your most recently rated round will be included in the calculation. However, if any one of those ratings is either more than 100 points below your average rating or more than 2.5 standard deviations below your rating – whichever number is smaller – that round will not be included. That works out to about 1 in 50 rounds getting dropped. Rounds where you DNF (Do Not Finish) are never counted in your rating. The most recent 25% of your rounds get double weighted which slightly boosts your rating if you have been steadily improving. If a player has fewer than 8 rounds in the last 12 months since their most recent round, then we’ll go back up to another 12 months until we find up to 8 rounds but never go back any farther than a total of 24 months.