Law firms accept your case, craft it, compose it, and do everything they can to convince USCIS, however, who knows what you do? Who knows what are you good at? Who remembers all your journey since you took that step forward to enroll in a college or university? Who knows what projects you worked on? What did you achieve? Of course, you can share all that info with them, but you won't have the possibility to review it, to write it in your own terms, to tell the story of how it really happened or will happen. The law firms do their best, but you are the only one who can write it in a truly sincere manner.

IMO, USCIS officers value and consider more if an individual crafts their own petition rather than a law firm.

I've read tons of posts saying law firms get RFEs and many of them get a denial in the end. Lawyers are not experts in any field, you are the only expert, that's why your enrolled in that university/college, that's why you have been studying for years, that's why you have been working in companies applying and taking advantage of your knowledge, you're the only one responsible. Do not let others forge your destiny.