You're using STM32F415RGT. So go to the STM32F415RG Product Page:
https://www.st.com/en/microcontrollers-microprocessors/stm32f415rg.html
Look on the 'Tools & Software' tab:
https://www.st.com/en/microcontrollers-microprocessors/stm32f415rg.html#tools-software
And look under 'Product evaluation tools' for available boards.
The STM32F4DISCOVERY is listed - it uses an STM32F407VG.
Downside of this board is that you have to manually connect the ST-Link's Virtual COM Port (VCP).
Alternatively, go to the Nucleo Boards product selector:
https://www.st.com/en/evaluation-tools/stm32-nucleo-boards/products.html
You can search by the microcontroller used; eg,

See which one most closely matches the feature set that you'll actually be using ...
A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.