AR increase to 11-13 makes sense
If wingspan can not increase, tapering has to be added
Wingspan could increase by splitting into multiple pieces
Considerhttps://www.appliedaeronautics.com/
when splitting into multiple pieces, calculation of the maximum shear force of the material has to be done.
Run simulation on XLFR 5 to find the angle of attack
This happens when Cm vs moment gets close to 0 and the plane will settle to an angle
winglet is not necessary