It's 40 ranked STROKE PLAY rounds SINCE becoming Master, with your ave getting to 62.99.
Your stats say you have played enough ranked rounds ( I counted +50) now you just need to reduce your ave.
Your very close to the move up with 63.30 so play courses you know you play well. You need to be scoring 30/31 for 9 hole games or 64 or less for 18 to reduce that ave.
Par 70 courses like St Georges & Oakmont are better to reduce an average as a -8 on a par 70 = 62, whereas a -8 on a par 72 =64. The latter will not reduce your ave but the former will.
Also, Ctth, Blitz, Skins, M/P, A/S games will do nothing to reduce your ave score, it's only S/P.
Happy battin' my friend and good luck.
LE