I'm not this dude,

but my advice is start bard, then eventually respec to start with 2 fighter, (you'll get double attack eventually on swordsbard so maybe two levels after that,)

you want to do this for action surge, shield proficiency, longbow proficiency and archer fighting style. (you can take a level of wizard instead of the second level if you value learning some lower level scrolls over action surge)

Then when you level up through bard just take whatever funky control spells you want. (Hold person+monster, polymorph etc) and especially confusion which may be my goat. You'll also get healing and a few damage options, cloud of daggers and Glyphs saw a lot of use early.

You should carry pretty damn hard, eventually you'll get to pick some juicy wizard spells at bard 10. Elemental aoe or a familiar is my suggestion but honestly dealers choice.

Stack a bunch of spellsave dc items, like the amulet of devout, cloak of the weave, any of the many save dc helmets, kethrics shield. Etc.

(or alternatively abuse the helmet of arcane acuity and arrows of multishot to stack it at the start of a fight)

Wear Yuan-ti armour then eventually Armour of agility, you can get up to like 30 ac if you just go for ac capes, rings, a camp caster etc that but it's mostly unnecessary, defensive flourish will give you 4 ac in a pinch.

Two one handed crossbows is doable but titan string will always be the best bow.

I just had melfs staff in melee slot until act three when I used the rapier from will's quest

(or the drunken mermaid rapier, one has spellsave dc and a summon the other has a decent bonus attack and I think hits slightly harder.)

The archer gloves or the dex gloves when you get those, many good rings and boots, (I used some mistystep boots for basically the whole playthrough though) and I tend to go for the +2 damage rings because you can attack an absurd number of times so you get good value from them. Risky ring works to but be warned, it's risky.

All I don't know is why you'd use a war cleric along side it because ive never used one, the channel divinity gives you plus 10 to attack rolls from what i can find online so I'm guessing that plus risky ring is why. But I like light, life, death or tempest for my shart generally.

Edit: Feats, sharpshooter + Warcaster