Most men in the world have good hygiene, some kind of job (even if they aren't wealthy, as that's what women usually mean when they say "have some kind of a job;" they really mean "earn six to seven figures yearly," and treat their partners with basic respect and affection (you didn't mention this, but I assume it'd be a requirement.) That's like 98% of straight men; not hard to find.

Most men globally are 174 cm, and in the US, 180 cm (5'11"), but to women, that's shit-tier and undateable, as the bare minimum is 184 cm, which is 6'0" or 6'1", and even that's only a "C" as far as grades go. So if you want 5'9", then that disqualifies a good 20% of men who are sub-5'9". 60% of men are going to be 5'9" to 5'11", and only 20% are going to be 6'0" or taller.

I'm a cis female and mostly straight

What does that mean? You're a lesbian (queer)? You really want a relationship with women? There's no such thing as "mostly" straight. You're either heterosexual, asexual, or you're queer (a lesbian/gay man.) Self-respecting men don't want to be with lesbians; that's literally cuckoldry. People of both genders tend to want to be valued and actually wanted by their partners.

you need to meet more of the nerd/cringe women

They have the same standards. That's why you get 400 pound cringe women like Lizzo and Tess Holiday still expecting their men to be 6'+ with abs. Women in general tend to have double standards a lot of the time, so Lizzo is still going to want a man in far better shape than her, just like Lisa Ann, the 50-something year old porn star, still expects a good quality man who doesn't watch porn and will "respect" her as a relationship choice, despite her years of doing adult movies. Which again, is ridiculous.

James Marriott is sexy according to them

I don't know who that is, but he looks soy as fuck. I was watching a video about a pedophile, Gigglygoon Clown, on Turkey Tom's channel on YouTube and he mentioned that said pedo had a girlfriend. Old me would be depressed upon hearing this, thinking even a disgusting pedophile and degenerate could get a partner and I couldn't. But over time I realized that the ability to get a female partner was not as special as I thought it was; it usually just means destroying your own life or living it solely to impress some woman who won't give a fuck about you in five years. Either simpery/sugar-daddy'ing (if you're under six feet or otherwise unattractive) or being an abusive asshole (if you're over six feet/attractive looking); that's how you get women like 95% of the time. And I refuse to bribe my way into someone's heart or treat a girl like shit, just to not be alone. It's not like I can ever grow to hit 6'5", anyway.

So I'm alone. But I now accept it isn't 100% my fault; I didn't choose to be a manlet or be as ugly as I am, or have dignity and self-respect and not play the Simping Game or be a doormat for women. I don't post on this sub and I sure as hell don't consider myself to be an "incel," but I saw your initial post linked by someone else here on SaidIt and responded to it.