I do not like to invest again in mining sites because i have a bad experience before that i got scammed and i do not like to happen to me again that is why for boosting my income in bitcoin i choose to invest in trading it is very convenient and easy to earn bitcoin.
Yes i dont know good where to invest but i can tell you to not do it in mining sites because these will run away with your money eventually and scam you so maybe you can invest in gambling sites instead but anyways you have to be really careful