it's gonna be a boring experience to stack sats nowadays only from spot trading since it takes time and can only benefited from price going up.
margin/futures trading is a hype lately in cryptocurrency and many traders prefer it to spot trading.
at first i avoid it as well, but now i dwell into it since i could get profit, and loss, from both up and down movement.

but if you still don't want to margin/futures trade, the best way to stack sats of course to stick with bitcoin and scan for new projects with good prospect for short term, like defi craze that we've seen lately (sell and forget, then put your profit into bitcoin).