If you want to earn you need to invest.
Don't feel regretting when you will invest to bitcoin. Just buy some alt coin like monero and it will give you decent return.
they have free opportunity to earn bitcoin even you dont have capital or 0 investment like signature campaign by doing posting yku can earn bitcoin but you need to rank up your account to earn good. You can service like selling bbcodes and designing for sure you can earn a lot of money if you do this. Other people also become campaign manager to the campaign but this is not easy you need more time and effort . But if you want to invest its your choice. Thats right monero gives you decent profit.