How can I transition from being only a studio photographer to a more editorial photographer and do creative photoshoots?

Find your specialization. Find a unique look, branding, et cetera. Then simply start rebuilding this side of your portfolio. Offer to do free work, plan on lots of rejections even for that but branch out and network. Then update your website, social media to launch your new portfolio and area you want to focus on more. Give discounts for that side of your business, slowly cutting those out as you book up more. The biggest issue with the highly creative shoots is the market for them. So, start local and free/cheap. Grow from there.