>>213440553 (OP)
lean into the camp of it. Acknowledge it, and have fun with it.
To many fan concepts, comics, and even that stupid movie tried to make the power rangers more mature. They were all dark and serious, with maybe a quip every now and again. It was brutal.
The best way to make power rangers cool again is unironically take from Sentai. Just embrace the fun of it, but then occasionally have a serious moment. Just enjoy the tonal whiplash you're allowed in a super hero tv show. Make it bright and colorful. Have them fight a giant pizza monster and drive crazy robotic cars that turn into a huge mech. Let them pose at every possible opportunity. Add explosions and colors and fireworks behind them whenever possible. Just enjoy the fun parts, add some minor dark areas to give it some depth, and roll with it. Sentai's (especially Kamen Rider) have had the formula down for decades.