Your next 8-bit MCU is a 32-bit. It’s called STM32C0!
Bridging the gap between 8- or 16-bit MCUs and higher performance 32-bit MCUs, the STM32C0 provides access to the benefits of STM32 designs. Powered by the industry-standard Arm® Cortex®-M0+ core running at 48MHz, the STM32C0 lets developers do more with less.
https://www.st.com/en/microcontrollers- ... eries.html
STM32 Nucleo-64 development board with STM32C031C6 MCU, supports Arduino and ST morpho connectivity
ttps://www.st.com/content/st_com/en/pro ... 031c6.html
Discovery kit with STM32C011F6 MCU
https://www.st.com/content/st_com/en/pr ... 16-dk.html
Discovery kit with STM32C031C6 MCU
https://www.st.com/content/st_com/en/pr ... 16-dk.html