I was in exactly your position OP, I’m not a designer but I’m freelance and work in publishing in a creative job.
I had six months’ work cancelled last year and it has very very slowly built up again and I’ll be full time for the next six months - to say I’m relieved is an understatement.
Are you on LinkedIn? Boring I know but I think the best way forward for freelance creatives now is recruitment agencies and they are all on LinkedIn. Google creative recruitment agencies and you’ll find some to approach.
I treated looking for work like a full time job, so spent days working on my cv, portfolio, website, LinkedIn profile. You can also use Instagram as tool to promote your work - anything to get noticed really.
I also applied for every job going whether I was over-qualified or not. I ended up with about 4 different CVs all slightly different depending on what the job I was applying for was eg, one was for print publishing, one for digital publishing etc. I have applied for about 30 jobs I reckon... 29 of them didn’t respond. One of them did, I had four interviews and I got the job. I still can’t believe it. It’s been really really tough and I am honestly waiting for this company to call me and tell me I haven’t got the job after all!
I also wouldn’t work for free but I would tell all my contacts that I was available, maybe send them an updated portfolio?
It’s really hard not to lose hope but you have to keep plugging away at it - you only need one person to say yes.