One thing I'd do is make capships more dependent on their support fleet (and by proxy, titans on their support capship fleet), while also making the fleet more reliant on the capships.
This is partially done with auras and support abilities ofc, but it could also be done via an "attrition" system where if you don't have enough fleet supporting each other (too few caps / too few frigates / too few cruisers), you suffer an attrition debuff to repair/regen rates due to bad logistics.
This could in turn lead to extra elements like a capship specialized in providing backend support to fleets (mitigating most of these downsides if you want to do guerilla warfare with small groups), or even a Titan which has an aura suppressing the whole thing as it's main deal.
No serious suggestions ofc, just musing. 