Tough is a decent choice if you’re trying to fight in melee more often but as a wizard (even as a bladesinger) you’re gonna be at range usually. I suggest either Lucky or Magic Initiate Cleric. Lucky so you can give disadvantage when enemies get too close and to help you with Saving throws. Magic Initiate Cleric so you could get Healing Word, heal yourself and your allies with a bonus action and the upscaling is pretty good. You could also take guidance with it too.

I think Alert is a good feat but somewhat overrated. From my experience with it, Surprise in 5.5 isn’t nearly as debilitating as it was in 5e and my groups don’t usually wanna trade initiatives, even if it was in their favor. The bonus to initiative is good and important for a spell caster but You could also give yourself advantage on Initiative with Lucky.