300 for 1-2k words isnt the issue at all, people pay that no problem. the thing nobody really said yet... clients dont buy "words", they buy outcomes. you can write the cleanest human sounding copy in the world but if you cant tell them why this headline beats that one, you got nothing to stand on when they ask.
couple things that helped me when i was starting and bad at the sales side. dont try to learn "copywriting" as some big skill. just study what already worked. grab old swipe files, real ads that ran for years, and rewrite them by hand. you start to feel the rhythm of why stuff converts without needing to be a natural salesman. ai cant teach you that part, it'll just average out everything into mush.
and yeah the blog/seo route to start makes sense, lower stakes while you build a portfolio. but honestly id pick one niche and go deep instead of being a general copywriter for everyone. easier to sound like you know your stuff on linkedin when youre the "saas onboarding email guy" vs just another writer.
last thing... dont undersell yourself cause youre eastern europe. half my best clients never knew or cared where i was from. price on the result, not your timezone.