Most people here ignored the fact that OP is lv48. XQ are only available at lv50 and you need more than just lv50 to do them, actually. The easiest variant for you is doing Floating Continent AQ until you get 90/300 Brahma Sky Pyroxenes to get Fleetmalinka/Slyphmalinka (depends on your own decision).
As for killing bosses, Gunner shouldn't have problems with that if you know how to time S-Roll and S-Roll JA. Banthers are actually bosses that can juggle with everyone, you just need a bit more time to get used to them than to other bosses.
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