It's hard to tell without seeing your box but since you pulled Big Mom, I think focusing on her batch is a good idea, since their books are coming in 5 FNs so that's 3 months at least, probably closer to 4. Out of that batch I'd say Cracker and Perospero are the best ones. Smoothie is used often enough because she's decent utility and the only Burn remover for a while I think.
On Japan, they skipped two batches so far :
- Warco batch : Strawberry is by far the most used unit from that batch, great utility and also 1 turn barrier remover. The 3 other units are kinda niche, INT Boa is ok, 2x attack boost for INT and PSY.
- V2 Sanji batch : Zeff is great for Fighter teams, probably their best affinity booster. Tamago is a good block orb manipulator for Fighters (better than legend V1 Jinbe). Pudding and Pekoms are fairly niche.
Even though Chobro is a great unit for many teams, I'd advise against giving him too many skill ups because the next two FNs will bring V2 G4/Nami batch books.
Katakuri and Tesoro batches are coming in 3-4 FNs so it's probably worth spending some manuals on those units aswell.
If you didn't farm Katakuri batch books back when he was released, Bobbin is a great utility unit, quite high priority imo. Oven from the same batch is good aswell for multi turns atk boost.
From the Tesoro batch, I think Dice is the best pick of the bunch, universal atk booster for QCK/STR captains. Baccarat and Carina are good utility units aswell.
