flashing bios is always the risk. Though flashing same manufacturer/same SKU BIOS should be the smallest one.
just a warning: power limit is not for "show". higher power limit means higher p-state values and more heat. So account for higher need for cooling and most probably louder fans.
max out your current power (probably 330W), load up the card and check temps/clocks. If it's already into high seventies, there's not much budget left there. higher PL might just overwhelm the card. many nvidia cards like undervolt though, and it might be that going that way may actually net you higher clocks.
i have 3070 and until i get my custom loop block, i went undervolt route.
in stock, my gpu ran at toasty 1,08V and stuck around 1930mhz core (then hitting powerlimit with loud fans and high temps). I changed p-state curve with afterburner and now it goes to 1980-s mhz with 1,025V. That little powerlimit headroom (and temp headroom) allowed card to run cooler and faster.
i'll flash my card after putting under water though, then i know i have proper cooling headroom.