Hi,
My answer may be quite surprising but I would say: don’t be greedy. You can make profit with bitcoin, but as in poker, it is better to take your time and make “sure” movements.
Maybe, at some point, you will thing “I should have bought right before” or “I should have sold after”, but you can ensure steady profits through the forecast of long-term trend. Nothing can be assured but if you bet small and steady, I think it is your best chance to increase your profits!
Otherwise, casinos and other gambling websites can be interesting (their margin is generally around 1%) so you really have a chance to duplicate your btc!
Indeed, being greedy is one sure way to make sure you lose everything. The most important thing is long-term thinking to ensure that your investments are safe and secure and you will not lose them fast or get scammed which are huge concerns in the crypto community right now and also very unfortunate.
By the way casinos have much higher than a 1% advantage. That is only if you play perfectly, but most people do not and therefore they have a much higher edge than that.