TCL 403 custom ROM

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hi!since i have no idea how to make a custom ROM nor do i know how to learn, could someone out there make one for me?i can give anything that's needed and my phone is rooted with Magisk.the reason why i need a custom ROM?two words: Android Go.i need a lot of stuff Android Go just doesn't offer; full Google app, Assistant, etc.i know my way around fastboot and ADB, too.i'm good with installing custom firmware, just not making it.cheers!