Alot of them use software to automatically screen people out, specific keywords.

Might be your resume, or even that you have too much experience. Some employers are looking for desperate low level experience in some cases

I used reddit for resume advice, and they critique it, r resume I believe. But make sure to be specific in your request otherwise you might get all over the place answers. But it will be hard if your resume is lacking experience.

I feel like networking is done mostly in person and tech mostly used LinkedIn

Without lots of money, it’s not doable reliabily