Looking for some team help and advice

You have some solid servants, especially towards doing damage. Looking at your servants and seeing their levels and skills + how many servants you have in the same category I can see why you are struggling.

Simply use this formula works in most things in this game, take the 2BP raid for example.

Formula is when creating a team to have one damage dealer servant, a support and either another damage dealer who is effective e.g. have a lancer because the hands are archer OR have a support and preferably has an AOE NP if not that's fine.

Now luckily for you, you have an abundance of amazing damage dealer servants that can take out pretty much anything i.e Kintoki and Jalter so for your sake I'd make them your leading damage dealer. Just get them up to max LV. Simply as your support have a Waver from your FL. He makes life easy for you trust me. On the other slot it depends on what you want/have/need.

Like ask yourself this if I have another damage dealer will they optimise the team or would they be a detriment and make the entire team suffer. Like as for me I prefer safety over damage. So for me I like to have another support as well to help the team aka Waver or Helena which you have. If you want to have any damage dealer then having someone who has an AOE NP is ideal.

If you want help on making teams around certain card types then that's easy. Say you want to build an Arts team, for me I look at the formula once again. Damage dealer[my servant who is going to abuse their NP] a support and then either a support or damage dealer or a hybrid in both.

So looking at you team who I'd pick would be Shuten/Jalter - Waver or Tamamo Caster - OG Saber or Waver/Helena depending on if you pick Waver/Tamamo in the second slot.

People say Jalter isn't optimum in an Arts team as she is SO much better in a buster crit team but her NP + 2 arts card and her passive in gaining NP every turn makes it hard not to pick her. Tamamo and Waver are obvious choices, Helena as a support is really solid, really like her. OG Saber can be a NP damage dealer but her role as a hybrid is what I like best. Can boost attack, give stars and also has a solid NP

Hopefully I made your life a little easier with this.

There's a guide here on Gamepress regarding team compositions.

In my experience for playing for six months, I've been fond of Buster smash. I didn't have the need to switch servants during story as I have Heracles and Kintoki plus Waver for defense buff. While it is better to level your available servants, I suggest stick to one consistent team at a time. I only have 11 max leveled servants with skills properly raised. My rule is stick to the team I am comfortable using with, regardless if they will sync or not.

Here is my insight based on what you want to know regarding specific team compositions. Raise Heracles, Nightingale and Kintoki for consistent damage dealers. They fit on Buster teams. With supports like Waver or Mash, they can survive a little longer. If you want to deal more damage, Rama and Jalter is useful for their buster crits. Again, Waver will be your friend along with Hans.

Orion will be your main damage dealer and Helena as support if you want to go Arts team. Orion has a high passive crit damage thus Waver and Hans will synergize with her.

I'm not really sure on Quick teams because my only properly leveled quick servant is Atalante. If you want to go quick route, pair her with Anne and Mary along with your assassins for star generation like Cursed Arm Hassan, though Hundred Face Hassan and Shuten will likely work on arts team due to their NP card.

As for the 2BP raid, your team can be Jalter + Altria + support Waver. If properly leveled along with their skills, Altria may one shot hands due to her NP and Jalter will finish Ibaraki. This can be done with a minimum of two turns.

In terms of leveling the skill of your servants, at least make your main team 4/4/4 if not 6/6/6. I tend to raise my servants skill if they are on support tab so they will be much useful to my friends. Hope this helps.