Develop for Ethereum, Cardano, or Polkadot? Which environment is growing quickly

I am playing around with the idea of exploding tokens or tokens that lose value if the holder does not do something.

Where would be the best place to start developing these ideas? I can do the programming myself but I would like to launch it on the crypto community with the most momentum right now.

Ethereum is of course the biggest, but it is easy to get lost in the noise. Cardano seems interesting and polkadot may be gathering momentum with polkaswap but I have been out of the crypto world for a bit and want to know the best community for creating something new right now.

Also of course it would be good to know which communities will need developer talent in the mid term.

I have been around since 2013 but my old account got hacked so I had to create a new account.