Through out last year I find it hard to get things done with funds despite how my earning was and I find it hard to spend more on my bills around me , though I have been seeing some humans earning and paying bills with one source of income and I do ask myself how is it done
please your advice will be of help
If their income is more than enough for them and they are living comfortably then there is nothing wrong with it.
You need to re-evaluate how much you earn and how much you need, some people could live with a single source of income if their salary is higher than the cost of living, but if you are earning a minimum wage then you need to look for other source of income or side hustle to maintain what you need and to have money to spoil yourself or family.
some time some people are just living with bare minimum and there are plenty of them, minimum wage exists to give us quick glance that the whole country probably made up majority by these people earning minimum wage and they could cope with it maybe because they lived bare minimum living in the cheapest rented apartment there is, also just eating the cheapest food there is for example instant noodles which might be harmful if consumed long term but what they can do, definitely just keep on consuming that.
the only way as you said is having side hustle to increase the income or find a job good enough you will get enough earning for living and still have some money left.
after all money not falling from the skies.
one way of them might be investing and trading, find a way to turn that money into some good profit for us to hustle around, adding income to another level.
by then we will be comfortable enough.