Turn the fan back on and check for wobble. If it continues, one of the blades is probably out of alignment.
Alternatively, at this point you can unscrew the fan blades and clean them further. Dust can build up in the gaps in between the blades and the flywheel, causing misalignment after a while. If any of them are loose, unscrew them, remove them, and clean the blades before replacing them securely.
If any of the distances are slightly higher than the others, try bending it up or down gently at the blade holder. Be careful not to snap or jostle anything that attaches to the flywheel. Just use a little bit of pressure to align the blade.
If the fan still has some wobble in it, you can add another weight to the same blade. If the wobble gets worse, remove the weight and use the clip to find a more suitable location.
