If the plastic blades of the electric fan are damaged, they must be replaced. Accessories can usually be found in electronic markets or online.
If the glue method is used, the normal use state cannot be achieved at all, because the fan blades are formed by one-time injection molding and there is a balance between each blade adding a load (.glue) will cause the problem. The dynamic equilibrium causing its rotation is destroyed. Although it can be glued well. There may also be unusual noises at work.