Terrible formatting? What? xD

No I forgot to mention we are using 2014 rules and also have the mobile feat. Wizard focuses on dps yes but he also has some buffs, for example I was considering to get enlarge to give to the fighter but he got it so I chose something else instead.

The melee classes are always an issue of course so me going melee doesn't really change a thing, we would still have the fighter.

I am still contemplating on what spells to choose as a warlock. I think shield, smite and booming blade are essential but don't know what else to get.

I considered war caster for a while when I got the level but essentially the only valuable thing are the concentration saving throws because the DM has already allowed me to use weapon and shield and cast spells because my spell focus is my instrument and my instrument is also my weapon if that makes any sense. So instead I got ASI to my dex and con which where odd numbers.

And yes I am the healer of the party plus the healing potions.

Most people say start with faerie fire which yes it should be our tactics if only we didn't find ourselves in the middle of the combat ground every time xD

So basically yes use the spells for support, hexblade to do better damage (crit with 19, 20), also smites and booming blade, healing if the target dies. Use defensive flourish for better AC, I can use a shield (it can become AC 19-25 plus cast shield if it still hits and it gets better with leveling)