The only reason to use aquarium salt is to treat finrot or injuries Some experienced keepers don't even use it at all. Do not use it as a regular additive.
MicrobeLift NiteOut II is among the few products that contain the proper bacteria that produce the nitrogen cycle, Nitrosomonas and Nitrospira. (Safestart, Dr Tim's One and Only, TLC Smartstart, ATM Colony are others.)
I suggest you soak you filter cartridge in it, then put it back into your filter.
Everyone here knows I am not usually an advocate of fish-in cycling. But a closely-monitored 10gal is as safe as you can get. A 50% weekly water change will probably suffice, and is a schedule that you will continue forever, even if you decide to add other stock.
I read the MicrobeLift info page. I recommend using only the NiteOut II product. With only one Betta in the tank, you won't need the biological breakdown feature of Special Blend. You definitely don't
want to use the KH booster. In fact, you never want to mess with your hardness(KH) or your pH. Your fish will adapt.
Test water every few days. Get some live plants, especially floaters. Let us know how it goes.