Maybe MJ got an extra little bit outta his wingspan by hanging around for a long time, but there are not traditional remedys to get longer arms... save one. Be taller.
Since your wingspan is equal (give or take) to your height, then you just need to hope and pray to be 6'2" and up. MJ had good arm length, but he was also tall.
If you are looking for drastic measures, you can have limb lengthening surgery that takes years and years and involves breaking and rebreaking the bones in your arms and pulling them apart so calcification can take place to make them longer. However, I doubt you care enough about that one or two inches to really want to go through that.
try stretching your arms more often. you will feel like you have longer arms. it helps me and i hope it helps you.
this is prolly your best guess