UPS is for domestic small items only. FedEx is for larger items as they price for dimensions not weight, i.e. shipping a bicycle box or similar is only something to do with FedEx. DHL is your goto for small international so long as it crosses boarders. USPS is also an option. The paperwork to ship will take an order of magnitude longer.

All shipping insurance is a 3rd party scam. Any mistakes are fatal too.

I was a pro eBay’r for a couple of years and knocked down $136k in total gross sales on the platform selling high end bicycle consignments. (It is not a viable business market due to the overhead and sleazy nature of fees structure obfuscation and bad seller services/support. Total overhead for the platform in 2017 with all fees, taxes, and shipping lumped together was never below 39% with a perfect account history. They go to great lengths to prevent you from knowing this number. It takes 3-4 months of meticulous accounting to extract this figure for any given month and close the books on real sales.)

The inability of USPS to reform and improve efficiency to reduce cost is one of our biggest grassroots small business inhibiting atrocities in the USA. It is a massive factor that few people understand or realize. Much of the poor performance of other carriers is due to the outdated and overpriced nature of USPS. Amazon has obliterated retail in the USA because they exploit this incompetent mismanagement of logistics. It goes all the way to terrible government. Like there is absolutely no reason for daily mail in all rural areas.