I've worked in both high and low-risk L&D units. I think your bigger difficulty would be adjusting to travel nursing after only working in one facility for seven years rather than the high-risk/low-risk issue. At high-risk facilities you have sicker patients more often, but as long as you have the experience and assessment skills, I don't think it's difficult to adjust. Also, from an L&D RN perspective, a higher-risk unit might be delivering more preterm or sick babies, but it's not like the actual work of the L&D nurse differs much in this case since NICU is responsible for the baby.
If you want to start traveling as soon as possible, I'd focus on finding a first assignment where you can be successful and get used to traveling, without worrying about a crazy acuity jump. Your recruiter's 1-10 question is difficult to answer, but it sounds like you have a decent skill base. But a lot of L&D managers will be focused on delivery numbers that you're used to on your unit, how many patients you're used to taking at a time, and how often you do things like mag. Some high-risk units will be really focused on these numbers, while others might be desperate and give you a pass. I'd still favor a good, functional assignment initially at a travel-friendly location, and then you can more easily experiment with different types of units later.