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how to make my crusader stronger with 500mil

hey guys so I just came back to maplestory around 2 weeks ago and I have around 500mil on my crusader. It is lvl 115 with a range of 3529-5042 w/o rage (is that bad average or good?) my current equips are

16/15/17/15 targa helmet
2/2/2/2 dragon glasses
3% str, 3% avoid, +80 hp half earrings
+4 str +28 acc red gaia cape
8str 6dex blue dragon armour
6att green mittens
4str 2 dex blue cresent shoes w/ +10str and 3% acc potential
117att sparta
6str maple shield
Larson's challenger set
evolving ring 1 lvl 16
zombie army ring
critical ring

those are my equips as of now (i know they arnt too great) and I was wonder what I should buy to improve my crusader
thanks!