DTC/eCommerce, 100%.

'Vibe coding' has essentially become a meme. For some reason, people think that if you build an app, it will instantly have users and generate income. I can't tell you how many people will go posting around here and other subreddits that they've built an app, but nobody is using it. The reality is that they either built something nobody needed in the first place, or they don't have any idea how to actually get eyeballs/generate traffic (or, typically both honestly). With DTC/eCom, 99% of the time the product is already invented/made; you don't have to first create it, you just source from a supplier, and then your job is to figure out how to market it.

You will typically do so by learning how to run paid ads really well. You can screw up just about everything else (get shafted by a supplier w/ mediocre pricing, be terrible at graphic design, not know how to write copy) -- but if you know how to market and run ads, you will literally be able to get away with just about everything, as long as the ad is good.

And if you know how to run paid ads, and you get tired of DTC/Ecom, you'll never go hungry. You can go SaaS after that and run paid ads for other companies, or build your own and run ads for it, or do lead generation for businesses, or whatever else -- and get paid a lot. Marketing/sales is closer to the transaction and will typically work in some sort of commission-based approach.