Since you have a Raspberry Pi 4, which supports aarch64, I suggest you download a 64-bit version of Raspberry Pi OS on which it is easy to get deltachat-desktop running: For how much would you port Delta.chat to ARM / Raspberry Pi? - #2 by dotlambda
Since you have a Raspberry Pi 4, which supports aarch64, I suggest you download a 64-bit version of Raspberry Pi OS on which it is easy to get deltachat-desktop running: For how much would you port Delta.chat to ARM / Raspberry Pi? - #2 by dotlambda