I think the single biggest thing they could do to get to $2T is build their own search engine, and ditch google completely. I think it's funny how some people (and Apple themselves) always say how Apple is so privacy conscious, while at the same time they made 9 Billion Dollars from Google by using Google as the default search engine in Safari (which most people don't change). So it seems they're willing to sell some of their users privacy for profit, and a very nice one at that.

If they just built their own search engine and used it as default, and it provided high quality un-manipulated results, I think even more would flock to Apple. Yes they'd take a (big) hit up front by losing out on all of that free Google money (estimated to be ~$12B in 2019), but then they could actually say with a straight face they were truly privacy advocates and won't sell their users data to Google via the Google Search Engine.

Saying how privacy conscious a company is, while literally making billions of dollars by indirectly selling a lot of their customers data, really rings hollow with me. Build a search engine. It's not as hard as building Apple Maps, and will do more good in many ways. Hell, even non-Apple people might use Apple search and fall in love with the results, bringing them into the Apple fold.