I personally have had the best luck finding jobs on indeed. Its a popular job board for a reason but that doesnt mean that there arent a ton of postings from companies that arent actually looking for employees. Its super shitty of them but work with what ya got.
I avoid any job posting that has weird requirements like they want you to take a test or want you to add your resume through thier website instead. I dont reccomend wasting your time with that unless the job posting looks really worth it. Rarely they are. I get the most rejections from those.
What i recommend most is trying to get a job in the same field or company that a friend works at. Much easier to get hired if someone can vouch for you. Thats how i got my current job. Before that, i was stuck in security and constantly job hunting with no return on investment.