The ornamental design for a beltaccessoryholder, as shown and described.
FIG. 1 is a bottom perspective view of the belt accessory holder of the present invention;
FIG. 2 is a top perspective view of the belt accessory holder thereof;
FIG. 3 is a top perspective view of the belt accessory holder with the belt strap fastened;
FIG. 4 is a top perspective view of the belt accessory holder with the belt strap and accessory strap fastened;
FIG. 5 is a perspective view of the belt accessory holder, shown with environment; and,
FIG. 6 is a perspective view of the belt accessory holder shown with environment.
The broken line showing of the pants, a belt, an umbrella, and a bottle are included for the purpose of illustrating environmental structure and forms no part of the claimed design.