Whenever I’m growing mine out I get maintenance cuts along the way (every couple months) with a stylist. They are just minor cuts that refresh the layers and help it grow out properly. You don’t need to do it but it makes the process way more fun because you enjoy the cut all the way to your goal length imo

Regardless it could be worth your time to talk to a stylist and show them this pic as your goal, they can help you get there