The workaround for vanilla youtube-dl is to use it with aria2, with options like:

  --external-downloader aria2c                                                                                         
  --external-downloader-args "--continue --max-concurrent-downloads=3 --max-connection-per-server=3 --split 3 --min-split-size 1M"

(possibly in your config file)

Also, neither --format best nor --format bestvideo chooses the best encoding in all cases; they use bitrate as a heuristic for quality, and a less efficient codec can have higher bitrate but worse quality, resolution, or framerate. The workaround for this is specifying --format with an enumeration of every combination of codec, resolution, and framerate in preferred order, which goes like this:

  --format "(bestvideo[vcodec^=av01][height>=4320][fps>30]/bestvideo[vcodec^=vp9.2][height>=4320] ...

Here's a full example (hmm... they're using it with yt-dlp, which I thought had fixed this?):

https://github.com/TheFrenchGhosty/TheFrenchGhostys-Ultimate...

I think there's a bit of variation in the exact order among the config files found online. If you're goals are archival, consider also retrieving metadata, thumbnail, and subtitles in all languages; I also have in my config the options:

  --verbose
  --download-archive ./ytdl-archive.txt                                                                                                                       
  --cookies ./ytdl-cookies.txt   
  --merge-output-format mkv
  --add-metadata --all-subs --embed-subs                                                                                                          
  --write-info-json --write-thumbnail                                                                                                             
  --no-overwrites --continue                                                                                                                      
  --force-ipv4

(the only remaining workaround for age-restricted videos is to give it cookies extracted from a browser with a real Google account logged in)