It's definitely not too short. Could even be a tad long... your leaned back in your photos. Like Billy Goat said fix your grip and focus on a more squared up stance
Perpetual futures contracts would allow you to do it without having to pick a time to maturity date. Derivative markets are mostly all zero sum so if you’re making money someone is losing it.
The risk in the scenario it goes to zero is the broker your trading the contracts with imo… Which is no...