you are right in that as a generalist i have no fear to start a job in any new tech stack, no matter how unfamiliar. but with hundreds of applicants to every job there is always someone more experienced with the tech stack used there. to win as a generalist you kind of have look for jobs in niches where only few people apply. i am struggling as a generalist.
I found much better success on wellfound.com (formerly angel.co) than LinkedIn. Much more startup and generalist-focused, whereas LinkedIn only produced through recruiter recommendations.