All business models are proven to work, yes some are more competitive but with some twists, creativity, a solid plan and persistence you can make it work.
It all depends on your skills and what you want to do.
I wouldn't recommend spending any of your small budget until you have decided what you are going to do and stick to it. Learn and study first, then implement, adapt and keep learning. Eventually you will have the skills required to make some money.
Internet marketing is so hard, don't expect that someone will give you a golden method for free to get you "a new life". The dream of making money online is fantastic and you can definitely do it, but it will require hard work, a lot of time learning skills, a lot of failures. Don't associate internet money with easy money, because it is not. If you are strapped on cash, work a real job and spend time and money on IM as a side business to start with.
If you are good at writing, maybe blogging or freelancing (selling articles on Fiverr or other places)
If you are good at seo design affiliate websites or create websites for freelance clients
If you are good at editing, make youtube videos about something you are interested in or knowledgeable about.
You get the point, educate yourself on methdos and business models. I would not recommend running ads or doing e-commerce because of your small budget.
Look into
Freelancing
Affiliate marketing
Youtube
Programming (hard skill but very valuable)
CPA (look into the laws of your country
Growing Instagram theme pages
Growing Tik Tok account
Print on demand/ creating designs for websites like teespring, redbubble
SEO
Becoming a VA of a successful internet marketer (you can try this for free and just learn a lot about what they are doing, why they are successful, and how you can implement their strategies yourself)
...
You can ask for help here anytime you want
But don't expect someone to just hand you a golden method that will make you money when you are starting with only 200 to 300 bucks.
Also: don't fall for people telling you that making money online is easy, they just try to sell you something or get affiliate commissions.
Don't start with 10 projects at a time or they all will fail...
Start a youtube channel, or one website, or Fiverr services or some Instagram pages,..... But not all at the same time.
When you start to make money then look into pivoting to other projects.
TLDR: educate yourself about the make money online world, don't listen to guru's, read a lot of threads here, decide what method or business model you will go for and just start for free. Don't spend all your money because you will most likely not see any returns and be dissapointed