So glad you are enjoying wearing you LO!!!
The Boba is designed for older babies/toddler 6 months and up. So that would not be a good carrier for you at this point. The Ergo might work, although you will probably need to froggie their legs (keep them tucked in) or get the infant insert. 7 weeks is kind of young to be using a SSC (buckle carrier like the Ergo and Boba). The Beco Butterfly 2 is designed for newborns and Olives & Applesauce also have an infant insert.
If you like wrapping with your Moby, have you considered getting a woven wrap? These aren't stretchy like a Moby and take a little more time getting used to. But if you enjoy wrapping, then this might be a great option since most babies outgrow stretch wraps like Mobys by 15-18 lbs. Wrapsody also has a stretch wrap that is kind of a hybrid and can be used much longer than most stretch wraps. That might be another option for you.
If you are interested in moving away from wraps though, you may want to wait a few more weeks until your LO is a little bigger before trying a SSC. You can also get a Mei Tai and some of those are easier to use with littler babies. It kind of all depends on what you are looking for.