Where to go from Rocket Brazilian Portuguese Level 1

Good Day, Sir: Really helpful and impressive resource you’re putting up here. Thanks so much. Quick question… I’d like to learn Brazilian Portuguese, and based upon your review Rocket seems to be for me the way to start. However, as you point up (and as I’ve confirmed with Rocket) they have no intermediate nor advanced levels (nor do they currently have plans to produce them). I feel a good foundation is key, so what would be your recommended approach to advance AFTER one was to complete Rocket basic level 1? Thanks so much! - BillT