When should I buy Polkadot?

Could you kindly provide some insight into when would be an opportune moment to purchase Polkadot? I'm interested in investing but am unsure of the best timing. Is there a particular trend or indicator that I should be looking out for? Would it be advisable to wait for a dip in the market or should I act quickly and seize the current opportunity? Your expertise in the field of cryptocurrency and finance would be greatly appreciated.