I would suggest that you continue on trading. For me it is the most safe way to grow bitcoin rather than investing it at hyips because most of them are scam but not all, others will last for month but will be eventually become a scam. Or gambling it because we all know that no one gets rich from gambling.
You are right we do not have to invest in hyip sites or any other schemes which comes as ponzi, all of their result is in the end the owner run away with the money of their members . if someone want to invest and grow his bitcoins then trade or self business is best option.