Since you seem to have had a lovely experience with the Hunter, and if you want to stay within the Royal Enfield fold, the Himalayan 450 makes for a great option for your sort of usage.
If you find it too big and heavy, the Royal Enfield Guerrilla 450 can be considered because it weighs as much as the Hunter but has a far higher performance and capability ceiling. If you want to look elsewhere, then the KTM 390 Adventure models (both the X and standard) are good options in the ADV space. The 390 Duke is a great option if you want a sportier machine.
Do decide if the aggressive and polarizing new KTM design philosophy is for you after the clean and pleasing lines of your Hunter. If you want something like the KTM 390 Duke without the in-your-face looks and colours, the Husqvarna Svartpilen 401 is mechanically identical to the Duke but has a far more pleasing aesthetic and is also more spacious.



