If your indeed job posts didn't bring diverse candidates then, why do you think it would now? Because you added a "Please apply if you're DiVeRsE" line to it? Don't be ridiculous.
If you want diversity of candidates you can't keep going back to the same talent pools. You have to diversify where you're drawing talent.
If your college program is primarily getting white/asian males, you can't suddenly expect it to start throwing in women & poc as well. You can't suddenly expect it to start giving you LGBTQ+ candidates.
If you want diverse candidates, you have to look at diverse hiring pools. Look at the bootcamps that focus on diverse groups you're targeting. Look at schools that focus on diverse groups you're targeting.
If you're really interested in diverse candidates, you can't keep expecting them to just show up if you add a "We want diversity!" to your job description - you have to change where you look for them.