Remove Unused Parameters:
1 . Find your Expression Parameters asset (usually linked in your Avatar Descriptor under "Expressions").
2. Manually delete any parameters you aren't actually using for toggles or animations.
3. Pro Tip: If you have many to delete, use the Avatar 3.0 Manager to speed up the process.

Optimize Your Types:

1. Convert Int or Float parameters to Bool whenever possible. If a parameter only ever needs to be "On" or "Off," using a Bool saves 7 bits.

Unsync Local Parameters:

1. If a parameter only needs to work for you (like a local UI element or a personal setting), uncheck the Synced box in the parameters list. Unsynced parameters do not count toward the 256-bit limit.

Use Parameter Compression (Advanced):

1. Tools like VRCFury offer a "Parameter Compressor" component.
2. This can automatically pack multiple toggles into a single 8-bit parameter, effectively letting you bypass the standard limit