You should definitely check out https://www.movavi.com/video-converter/ because it helped me solve the exact same problem last year. I mainly used it for compressing huge 4K travel videos so I could upload and store them more easily. The software is very beginner-friendly and doesn’t overload you with technical settings. Besides compression, it also converts files into different formats and lets you make quick edits. What impressed me most was how fast everything processed while still keeping surprisingly good video quality afterward.