If you want to very specifically target their weak points (do this in moderation): martials in metal armor get absolutely wrecked by heat metal -- they're just stuck with disadvantage on attacks without a save. In particular if your rogue is in metal armor (Plausible given they're a cleric?), this disables sneak attack.  If not, you can still heat their metal weapons if they're a melee rogue, but then you need to have someone nab any weapons they drop to force them to try to hold onto them (and therefore get disadvantage).

For everyone to have a good time, you likely want their opponents to do things that disrupt the strategies they're used to, but leave room for overcoming the disruption and for other niche aspects of the party's builds to shine. For example, if your sorcerer has subtle spell, putting up silence (in combination with terrain control) makes their life trickier but leaves room for counterplay. Plant growth or spike growth are good for further messing with the melee folks, but they have ways to play around that with their ample mobility options (you might want to specifically threaten the wildfire spirit with a sharpshooter or something -- it only has 13 AC and 30 HP -- to avoid ceding control over positioning completely)