Gambling and all "investments" that are so risky they might as well be gambling (HYIPs, pyramid schemes, etc.)

Games where the main factor is whether or not new "investors" join the game. Also any Bitcoin-denominated investment product with an APY far above the reasonable market rate.

I bought it at 21 and 19 and sold it at 22. 5% profit

Sounds to me that you are looking to lose money, get scammed or to gamble for the mere sake of it.

When members are repeatedly suggesting that you do some research, they are trying to be nice to you, which really means that you need to look around more and maybe even practice more, which also might mean to look more closely at yourself too, including how you are playing your own finances as well as how much of yourself you are planning to invest into something that you admittedly do not know but seemed rush to learn the nuts and bolts.

Many times when guys (and perhaps a gal or two) are able to make decent money in trading BTC (and the use of other financial instruments), they might suggest to you that it is easy, but the good ones will have spent a considerable amount of time practicing such trade (hopefully with low amounts) and building their own expertise, which would then involve adding more sophisticated and complicated financial instruments after having had really gotten used to the more simple instruments.

You usually will not make more money by merely employing more complicated trading instruments, unless you already know the simple instruments well and really study and practice on a personal level with those more complicated instruments (and you likely do not need to be an expert when you start because you can learn as you go, with small amounts), because the more complicated the instrument are designed to be in favor of the house, and you have to know the instrument so well that you can overcome the ways that the instruments are designed to be in favor of the house in order to be able to make money or to make a killing from such instrument(s).

By the way, I am continuously surprised regarding how many folks (members) that I run into in this space who seem to be so unsatisfied with the simple investing methods with BTC that is likely going to make a lot of people a lot of money, just as it has in the past, but there are so many people who want to accelerate such money making process by 10x or more and therefore end up missing up on the considerable great opportunities that are available with relatively straight forward BTC investing strategies involving, buying, accumulating and holding.... and if you get the BTC part down (without getting sucked into get rich quick schemes), then maybe you can take 10% of that value and start to play with other more complicated financial instruments that involve hedges: such as leverage, margins, options and/or futures.. which also can sound like investing in an alt when BTC is risky enough and already with a lot of upside potential.

So the idea is to profit from this situation selling a future, while at the same time buying a bitcoin on the spot market, to be held it until future expiry.
In this way at the expiry you will have a bitcoin to be sold to your conterpart. Having bought the bitcoin at a lower price, you are actualy locking in the price difference you executed your trades.

This is a market neutral strategy: you are not exposed to market risks, bitcoin can go up to 30,000 USD or crash to 1,000 SUD and your profit will stay the same, as you are buying and selling a bitcoin at the same time.