Almost seems too awesome. People literally write books about significantly lesser improvements over longer periods of time (Dream On for example)
If true there surely must be mitigating factors. OP must've been a single figure in the past and/or had a change in approach to handicapping in some way.
https://smile.amazon.com/Dream-Challenge-Break-Par-Year/dp/0856408417
Dude played every day, got high level coaching for about free, and all the range balls he wanted. WAY more than your $2k budget.