Becoming a freelancer is very easy nowadays,. It has a very low barrier of entry, there are a lot of freelance platforms out there that all you need to do is to just build skills, you can learn also for free from youtube, what you need to prioritize is to mastery.
There are a lot of reelancer on the market nowadays so your competitions are very vast, you have to what you got to do, whatever skill you choose make sure you know it like the back of your hand, build a portfolio and make sure you standout, you can create your own blog and write about stuffs, so that whenever your name is typed on Google, they'll be something to read.
You can also game the system by paying some of your friends to review you on this platform, this will help with you ranking and will get you clients easily.