I found the same problem when I tried running off Pi OS 64-bit for a day—almost every app that _did_ have a Linux binary available was only able to run under x86_64, not on arm64... More here: https://www.jeffgeerling.com/blog/2020/i-replaced-my-macbook...
Zoom, Bluejeans, Dropbox, pretty much all the popular apps I used where I could find a Linux version for my Dell laptop, I couldn't find a way (though got close at least, with Dropbox) to run them on an ARM64 CPU.
Have you tried box86? https://github.com/ptitSeb/box86 Let's you run x86 (not x86_64 though) programs on ARM Linux. It does a neat thing where system library calls are converted to ARM system library calls rather than using x86 ones for better performance.
For Dropbox, you could quite trivially get by getting an FTP account, mounting it locally with curlftpfs, and then using SVN or CVS on the mounted filesystem.
...and we need new, more hardware for CI/CD that's just dedicated for Apple OSes. Pretty sure we won't be able to use the 5 unused raspberry pi we have.
(I recently tried to install Zoom on arm64 Debian and it didn’t go so well... Rstudio wasn’t even close to an option)