There’s some very helpful posts here on tapering off prednisone. You might find it helpful after a month or two on 7.5 mg to try very slow tapering (no more than 10% drop in dose when trying a lower dose). See image . One day of 7 mg then 6 days 7.5. 1 day 7 mg then 5 days 7.5 and so on - see posts on very slow tapering & image attached. Good luck with it. Good news that you r getting relief with prednisone.