I have noticed that some of the pool participants swap their BEE earnings into WORKERBEE and compound their "stake"... You can do that directly on BeeSwap:
https://beeswap.dcity.io/swap?input=BEE&output=WORKERBEE

Another way to obtain WORKERBEE tokens is to purchase them on the market... You can do that on Hive-Engine or Tribaldex...

https://hive-engine.com/trade/WORKERBEE

Cheers!