Join a glider club or buy a glider and fly it a lot. The time counts toward ATP total. If you own it, tow to 2000' = $48; therefore
cost to fly for one hour = $48/hr, cost to fly for 2 hours, $24/hr, stay up for 4 hours: cost = $12.50/hr., stay up for 6 hours, bring food, water, and a bottle to pee in: $8/hr...... and fun into the bargain!

10% of my flight time to ATP was glider.