First of all your post's title is very misleading, edit it.
Look brother, it's inappropriate to make posts like this. Developers do all the hard work for free, but they have a life too. It takes time, skill & a lot of trouble shooting to develop a ROM. So just give them some time, okay?
If we keep nagging them, the devs might feel annoyed & lose their interest in developing for our device completely. Tell me, is that what you want? The problem is we only want to take everything for free, giving nothing in return - not even a little bit of patience!! That's not how the world works.
Android 10 isn't out for this device yet, but we already have 4 Android Q based custom ROMs for A3. You can try those in the meanwhile.
No hard feelings bro, just wanted to share my thoughts with you. Thank you.