Go to Hekaton, and in just 1 round you can get x1.5 exp coupon for free. Better than nothing.
Just 30 mins for 1 Hekaton run, you can get x1.5 exp coupon which is quite worth it in my opinion.
When you finished Hekaton, you will be sent to a map to receive your rewards which includes x1.5 exp coupon every time.