I'd have the Familiar cast Haste on me, and take advantage of having an extra action on the first turn to send them to their pocket dimension where they can't lose concentration. Then I'd do whatever I wanted, though I'd make sure that at least one time I'd cast Shadow Blade at 5th level, and go to town on the enemies Booming Blading them with my action and making a regular attack with my extra Haste action all with a 4d8 psychic blade, because it's fun to (roughly) match the Bladesinger at Bladesinging and have it just be a hobby.

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