As I understand it, the point is to combine with studies? If not combined, then you can earn much more.
It is worth clarifying here: is the work of a receptionist considered equal to a "waiter" and a "cleaner"? If not, then there is a whole job market for about the same payment (St. Petersburg), from hotels to dance studios.
Night work in call centers, part-time work as a courier, bartender or barista, animator, anti-cafe girl, and even reselling goods with Ali! Only those who are looking for a job will definitely find it! :) Good luck!
IMHO 1. Binary options, typing text for a fee, finding information for a fee, etc. 2. Since you are 20 years old, then you studied somewhere, right? That's the specialty and go to work. 3. If you have ideas, or you are a very talented person, then you can sell your ideas. 4. Repurchase of shares, with subsequent resale to other companies. But it's risky. 5. If you have a powerful computer and charisma, then you can shoot videos on YouTube, with the subsequent monetization of your videos and donations. 6. Learn to play the music. instruments and play for a fee (this is not begging, but work.) 7. Create an account in any social. Network and sell advertising 8. Find land and start mining for gold.