Are web2.0 websites still useful for backlinks?

I have a fresh website on a fresh domain, i started it in october/november, then in february i had to switch domain so i redirected the old domain with 301. I'm sending mails to all the blogs/websites relevant to my niche i can find to hopefully get some backlinks but they always require me to pay them hundreds/thousands of euros. Does creating new websites with web2.0 platforms like blogger/wix/weebly and linking them to my main site still work in 2025? If so, what are the best platforms and how should I do it to avoid google penalties? thanks