Use a video compressor tool
Lower the resolution
Reduce the bitrate
Decrease the frame rate
Trim unnecessary parts
Convert to a more efficient codec like H.265
Remove extra audio tracks
Lower the audio bitrate
Shorten the video duration
Export with smaller file settings
Use two-pass encoding
Crop out unused areas
Avoid unnecessary subtitles and metadata
Save a copy instead of overwriting the original
Test different compression settings to find the best balance