User blog:0zeroace0/Slowly getting back into the game. Need some advice/tips

I'm slowly getting back into the game after 6 or so months.I like some advice on what to do next, what I should prioritze, what kind of squad should I be using. I'm currently at the sky fort right now story wise.I'm currently level 96 with 117 cost.I've cleared trials 001 and 002 as well as Grand Gaia Chronicle:Vargas.

My units are:

Guardian Darvanshel (G and maxed sbb)

Snow Queen Signas (G level 1 bb)

Alpha Tree Altri (G level 1 bb)

Holy Thunder Eze (G,maxed sbb,partially imped)

Rebel Angel Elsel (A level 1 bb)

Holy Master Aem (B level 2 bb)

Legatus Melchio (B,maxed sbb,fully imped,can equip 2 spheres)

Shadow Ronin Mifune (A level 7 bb)

Grahdens (level 1 bb)

Level 1 Inferno Goddess Elza (B level 5 bb)

Nebula Pearl Ivris (B,maxed sbb,almost fully imped,can equip 2 spheres)

Ominuos Slasher Aaron (A soon to be 6 stars)

Crimson Hood Ciara (O level 2 bb)

Fire God Vargas (L level 3 bb)

Ice Warrior Karl (level 1 bb)

Deity Ruler Lucca (O,level 4 bb,level 88)

Advisor Weiss (A level 1)

Dragoon Elder Bargus (G level 1)

Empress Lilly Matah (L level 56)

Dark Armor Reis (A level 1)

Grandt (O level 1)

My current spheres are(I really don't make spheres):

1x Dragon Blade

3x Goddess Seal

1x Dogma Shield

1x Holy Robe

4x Muramasa

1x Demon Rifle

1x Vine Lance

1x Thunder Bow

1x Star Blade

1x Stealth Robe

1x Demon Lance

1x Giant Stone

1x Refined Gem

2x Mech Sword

2x Flesh Armor

2x Sacred Jewel

2x Medulla Gem

2x Evil Shard

1xDandelga

1x Miroku Pearl

1x Soul Creator

1x Queen's Tear

1x Brave Crest

My current team is

Lead Grahden (Medulla Gem)

Ominous Slasher Aaron (Sacred Jewel)

Nebula Pearl Ivris (Queen's Tear,Refined Gem)

Guardian Darvansehl (Sacred Jewel)/Holy Thunder Eze (Mech Sword)

Legatus Melchio (Medulla Gem,Sol Creator)

Leave suggestions for possible improvements for my team and how I should optimze them as well as what my team is capable of completing