Teams? Again..?

God. Comp has been a nightmare. My first few seasons I peaked at 16 but now I’m always hovering at 12-13. I have pretty good units, but I have no clue how to build them at all, and don’t even get me started on defense.
I have a lot of good 4 stars but I mostly use my 5 stars so!
Right now, my main team is an anti legendary tiki comp, w b!hector, soleil, deidre, and flier olivia.
It was better than my dragons, myrhh, Ninian, adult tiki and Nowi. My dragons are a solid but they aren’t too good in these few seasons. I used to do lucina, l!ike, fjorm and maria, and that got me to 16 but I quickly dropped.

All my 5 stars (aside from everything already mentioned):
Laevatein
King Marth
Alm
Lene
Karel
RL!eirika
Mia
Masked marth (lucina)
M!corrin
Hinata
Black Knight
Sigurd
Eldigan
Rein sword
Rein fist
Knight exalt Chrom
Xander
Xander’s son
Elincia
Ryoma
Katarina
Canas
Sanaki
Tharja
Leo
H!nowi
Azura
Tana
F!corrin
Linde
Delthea
Tailitu
Ishtar
Odin
Ophelia
Ursula
S! Corrin
s! Camila
Brave Ike
Arthur
Groom marth
Cherche
Camila
F!Kana
Cecilia
Takumi
Hinoka
Jaffar
Legault
Sothe
Cat sakura
Sea Linde
Ethlyn

Thanks for helping me I’m a complete newbie to team comps-