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It takes time. I would keep working on your portfolio in the area you are interested in as most will hire based on your portfolio. Keep applying to jobs that interest you wherever you can. Eventually you will find a client, usually you have to be fast on these freelancing site jobs as they get filled with bids quite fast. You can also build your own portfolio website and run some ads but that will cost some time and money.
do you suggest any websites to take freelancing requests then ?
Upwork, freelancer.com, Peopleperhour and even cgtrader have freelancing/project section. Freelancing sites takes a lot of effort, you have to learn their rules, system. Some like Upwork you have to pay to even bid for projects. So these days I just get client from real life, word-of-mouth/recommendations. Only when I am really out of work do I mess around with freelancing sites and only on projects that are interesting to me.
You can try this as well but its for animation projects. https://indie.artella.com/home
