what firmare are you running? what install method did you use for that game?
Any CFW is capable of doing that and they all use the same exploit so its just a matter of preference which one you want to use for save editing. Currently there are 3 main CFW for the Switch of which I will list the available guides below:
Then if you're trying to install some recent games i'd suggest you to update to 6.2
If the game has an update or DLC packed in the .XCI file, then each of those will be outputted as its own .NSP file. Also order doesn't make a huge difference but the order is generally game -> update -> DLC.
The site is working from my end.
Nintendo Accounts are rarely banned. Also bans don't affect homebrew usage in the slightest; it only affects Nintendo-related services. For further questions, you can refer to the banning thread: https://gbatemp.net/threads/nintendo-switch-banning-hub-warning.508710/
There is only CFW that currently supports firmwares 7.X and that is Atmosphere so follow the sdsetup guide I linked earlier.
Split them. Just Google any .XCI splitter program. I have no experience with these as I don't have an SX OS license so not sure which ones are good or bad.
Use a USB thumb drive formatted exFAT.
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Psionic Roshambo:
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BakerMan:
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SylverReZ:
Always touching 
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