Over the years I worked closely with dozens of high-profile enterprise mega dealers in very different fields, but every one of them mastered at least one unorthodox trait outside the traditional "selling" skillset.
Here are some of my favorites:
1) Ability to perform thorough manual research on a target account. Yes, ABM technology can cover the data basics pretty well. But in order to tailor your messaging for the enterprise decision-making unit, you need to go through financial reports, quarterly calls with investors, interviews with C-Level execs, and other "non-parseable" sources.
2) Obsession over disqualification. Every step of the big enterprise deal requires severe labor investment thus you need to go far beyond the typical ICP + trigger approach and develop your own elaborate model for choosing the right opportunities to pursue.
3) Staying on the verge of the latest tech without becoming its slave. Most martech and sales tech tools are tailored towards scaling rather than helping with a small amount of very large deals. But sometimes there are breakthroughs and you need to spot them right away. A nice workaround here is to have a monthly meeting with the nerdiest colleague from marketing who will get you up to speed in two beers or less.
4) Ruthless usage of 80/20 in day-to-day operations. Enterprise rainmakers are often an indispensable and non-scalable resource. And thus you can't fix the bottleneck with additional hiring, you need to optimize every minute of your top performer's schedule.
Everything that can be done by a non-rainmaker should be done by a non-rainmaker.
5) Being an avid student of stand-up comedy. Sounds a bit childish, but top comedians will teach you two very important things - (a) the importance of timing in dialogues and live presentations and (b) laser-precise wording. The cleanest recommendations to start your journey would be classic Jerry Seinfield and Jim Gaffigan.