What should I do with my money?

Scrapping will never be reliable (like a 40 hr a week normal job) until you get big enough for people to bring their stuff in to you instead of you hunting them. Until then you need to keep looking for more items to scrap and spend a bunch of time researching (never ending always changing region and economics dependant) what you can sell instead of scrap for more profit. Also don't do something stupid and rack up debt. You are better off paying off a 17% credit card (for example) then keeping money in a bank account that pays you under 1%.