Couldn't run the scheduler after handling timer 5 Interrupt

OK, so my configMAX_SYSCALL_INTERRUPT_PRIORITY is 5,
My interrupt prio also is 5. It makes sense that my timer interrupt is masked.
In this situation what do you recommend me to do?
I am using the STM32f429 board with cube ide. and cubeMx.

Thank you in advance,
S.Tarik,