How could the USA hurt the Iranian regime enough, without adding to the number of innocent killings, to enable the protesters to free their country?

If President Trump refuses to meet with Iranian officials, will that diminish our ability to influence Iranian policy and change the outcome of the protests?
Do conservatives understand the Trump administration's threats to invade Greenland with "plans underway" will ultimately wipe out your 401K if put into action? You guys understand Europe has leverage and will respond (along with others)?