First I would say actively care about some user problem space. Make that your mission. Not "build AI startup". Not "get rich".
Let an LLM be a tool in that mission, but "AI" is not the end goal.
Second, build solutions in that space. Find the niches in that problem space nobody is addressing, or if they're addressing, they don't care as deeply as you do. So many "products" sadly are afterthoughts. Look even at Google Search, supposedly Google's bread and butter, but we see its quality suffering. You need to care _very_ deeply about the space. If you don't care deeply, it's not worth your energy to build the business. Just go get a job in your domain.
Third, think longer term beyond even the current product. Think constantly how you can disrupt yourself to get to the next product that obsoletes your current product. Build a company culture around this idea. Focus not on the last product you built, but how you build a culture for building product to address your company's purpose.
Fourth, when you think about building product - build something _so good_ that it essentially creates a habit among your users. You obsess about the tiniest of interactions in a way that is so brainlessly easy, sticky, addictive, whatever that very few will/can obsess to the same degree, in that domain, to truly build the same level of stickiness.
Finally, as OpenAI gets bigger, and tries to do more, you will find areas where they just don't care enough about a space that you can find a niche for specialized tools. Tools that are too small for them to really obsess about the same level you could. One idea, by way of an example, might be taking voice notes for doctors. Or dictation in general...
Anyway, I'd say stop focusing on "how do I build an AI thing". Stop focusing on building the next Unicorn startup. And just ask yourself - what problem do I care enough about to truly put my skills in service of to build a product?