Here is a secret trick: If a video is too large, don't send it as a video. Send it as a Document.
The recipient will have to download it to watch it (no auto-preview), but WhatsApp allows much larger file sizes for documents (up to 2GB on some versions). This is perfect for sending long lectures or family home movies.
For advanced users, there are Telegram bots that act as a bridge to WhatsApp. While you cannot run a bot inside WhatsApp, you can use the @YTDlpBot on Telegram:
This method keeps everything in the cloud—you never use storage space on your phone.
A 20-minute vlog converted to MP4 will be massive. Instead, convert only the highlight reel (under 3 minutes). Use a video trimmer to cut the boring parts.
For short clips (under 60 seconds), you can skip downloading entirely.