How long were you doing graphic design before? Were you in a specific industry or specialising in anything?
As a fellow graphic designer, if you have enough experience and skills, you should totally get back into that! I was made redundant during covid and decided I had nothing to lose by going self employed and it was something I'd always thought about and never had the guts to do.
I'll admit I've probably been quite lucky and my previous job gave me an incredible portfolio with amazing photography of stuff I had worked on, but I've been inundated with work. There is absolutely tons of it out there for graphic designers and creative artworkers right now. Even if you don't want to go self employed, it's a profession that is also very open to remote employment, especially post 2020.
Do you have a computer? I hate pcs but you don't technically need a Mac, and pcs are way cheaper.
Get yourself a free month trial for Adobe, along with a free trial for Adobe stock (and if you need to just keep signing up with new email addresses until.you can afford to pay for it!), plus use free websites like pixabay and unsplash to find templates and mock up images for whatever work you have that you can put into a portfolio, (if you have wall art/posters, put them in a photo of a living room with a frame on the wall, if you have packaging or product there are boxes/cans/bags etc) and if you need to, work on some personal projects to boost your portfolio.
Use chat gpt to give you briefs, or just create some posters, or some packaging or some branding for some made up company, ads in magazines, social media posts etc.
Behance is free and really simple/easy to use to put your portfolio online. You can even get templates on Adobe stock for printed or pdf portfolios if you need one but only employed positions seem to want that, most people are fine with a website/Behance link.
I get most of my work from Facebook groups for the industry I am in, but linked in also has freelance and employed positions, I've not used fiverr but there are lots of websites like that (they don't pay amazingly well but it's a good starting point). I haven't found the time to do any of this, but you could also sell your designs to greeting card companies, stock websites, use print on demand services to sell your stuff on t-shirts, mugs, bags, literally almost anything you can think of someone will be doing POD for it. Some of those sites will literally handle everything for you so you just upload your stuff, set your price and they sell it, make it, shop it and pay you.
Sign up for the Adobe MAX conference for free online in October too.
I did also do some content mill copywriting for about 6 months when I first started too, which paid really badly but kept me topped up until my graphic design stuff really kicked off.
Screw working for someone that's lying and treating you like crap before you've even actually started working for them. Although if they've not given you many hours I guess you could work for them (or someone else) to tide you over until you get your portfolio sorted and start getting work from your graphics.
Good luck!