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You can have mooks with evasion and maybe duck and cover for damaging AoE Supreme Storm Trooper Mickey Premium T-Shirt (unfortunately teamwork feats mean keeping close, while fireball screams spread out). This wouldn’t help vs black tentacles, but a grease spell or alchemical grease can give a +10 or +5 bonus vs grapples respectively. This requires planning, but if the PCs are well known monsters, some enemies will do their homework on their favorite tactics.

Low level spellcasters can also buff the actually dangerous creatures. Protection from good Supreme Storm Trooper Mickey Premium T-Shirt (or maybe chaotic?) could help vs an enchantment-specialist. Freedom of movement effects and the like also helps. Buff, healing, and summoning spells don’t break invisibility. Some battlefield control spells that aren’t cast on an area where enemies are standing and don’t do damage might not break invisibility (fog cloud might work, wall of fire probably wouldn’t). There’s an encounter somewhere in Skull and Shackles (won’t say where because spoilers) with one or more invisible support casters.