You might want to consider using a microcontroller that supports Bluetooth Class 1 power levels and the latest Bluetooth 5.0 encodings (e.g. LE coded PHY (long-range) which provides more range at the cost of speed). Combine this with a proper external antenna that has a decent gain or directionality depending on your application could help.
Otherwise, you could try using pre-amp front-end module ICs such as the Nordic Semiconductor nRF21540 (https://www.nordicsemi.com/products/nrf21540) that can amplify the output of a weaker Class 2 device to Class 1 levels.
Other than that, yes, the use of BLE Mesh will also extend range but requiring intermediate nodes to do relaying of data (which could require a steady source of power).
You might want to consider using a microcontroller that supports Bluetooth Class 1 power levels and the latest Bluetooth 5.0 encodings (e.g. LE coded PHY (long-range) which provides more range at the cost of speed). Combine this with a proper external antenna that has a decent gain or directionality depending on your application could help.
Otherwise, you could try using pre-amp front-end module ICs such as the Nordic Semiconductor nRF21540 (https://www.nordicsemi.com/products/nrf21540) that can amplify the output of a weaker Class 2 device to Class 1 levels.
Other than that, yes, the use of BLE Mesh will also extend range but requiring intermediate nodes to do relaying of data (which could require a steady source of power).
