Go to telecommunications and break the big players up and create marketplaces in which small players can innovate. Do it in news media and undo that awful communications act from 96 that led to industry concentration.
We need to take an activist attitude to anti-trust that actively seeks to create rabidly competitive markets which is what fuelled early tech's growth, instead of letting tech slide into the status quo.
And of course all of these companies will still have access to capital. They'll just need to convince investors that their product is better.