If available for your specific variant, these are the best choices ranked by stability:
You may find websites claiming "LineageOS 20 for Y5 2019" or "Pixel Experience ROM." custom rom for huawei y5 2019 top
Using the wrong files or a corrupted bootloader bypass can permanently "brick" your phone. If available for your specific variant, these are
This is the safest bet. It is lightweight, has excellent driver support for the Helio A22, and everything works: Wi-Fi, Bluetooth, audio, RIL (calls/mobile data), and the camera (basic functionality). If available for your specific variant