To make into a glider: stop motor. Take prop off. Fling or histart for launch minus prop (motor running won't make much thrust). Will it outfly a long wing? Probably not, but it will slope just fine. Might even discus launch. You can see how effective it is as a glider by running it on tick over speed from altitude. On highstart, don't add bunches of up unless you want a steep diehederal or wingless design. Could contemplate moving the CG backwards no more than 1/4 "
To really convert it, you'll need a smaller battery like maybe a 3S 850 mah. Way forward.