What’s your take on Upwork, Fiverr, Workana, etc.?

I’m a freelance graphic designer and I’m currently struggling to find new clients. I’ve spent the whole week sending out my resume on LinkedIn and Indeed, but I haven't heard back from anyone yet.
I know there are freelance platforms like the ones I mentioned in the title, and I’ve read both positive and negative reviews about them. Has anyone here worked through these sites? Did you have a good experience? Also, did the commissions/fees feel like a total rip-off?
If you know of any other platforms or methods to land graphic design gigs, I’d really appreciate the help!