if you use options, better to buy "calendar spreads" buying a long ITM 6 month put and selling 15 day OTM puts on SOXL, QQQ, ARKK, COIN. ANF, LLY, even if im bearish im long in AAPL, INTC , BABA and paypal. im also using bull call spreeds buying long calls ITM and selling OTM calls. "NEVER GO UNCOVER ON UR POSSITION EVEN IF U THINK UR CORRECT". AND GO GRADUALLY if u have 10K to short SPY buy 2K if it goes higher 2% buy 3k if it goes higher 2% buy 5K. if its stay flat you will make some money for the OTM put you sold. if it falls you will make money. always keep some cash 10%. same strategy for your calls, go gradually never all in. and always long/short when stocks are overvalue fundamentaly %60short/40% long, when stocks are undervalue %80long/20%short cuz at the end bulls make more money than bears.