I am too lazy to write anything cohesive. Here is starting point on things that will make the tank more survivable and persist it as a heavy weapon platform.
1. Hard-kill APS - active protection systems - mm AESA (fast, high resolution) miniature radar detecting threats and sending munitions to intercept them. See Arena, Trophy. Eventually, laser counter-drone systems for small swarms (see Israeli developments)
2. Soft-kill APS - smarter/highly-automated smoke deployment, IR smoke, radar chaff. Directed radar / IR blinders. (See T-90 systems failing in Ukraine atm)
3. Passive - lower signatures.
4. Target detection and automatic turret queuing - tanks have a lot of space, they can have sophisticated optics and computers that find targets (including OTH data from tethered drones) or find launches against them and can fire on that launch. This is less effective against fire and forget systems ala Javelin or systems like Stunga where the launch platform is away from the guidance system.
5. Trench sweepers and coupled 30mm cannons - tanks can airburst and clear trenches / buildings better.
6. Operating in fully jammed environments. This has NOT happened in Ukraine at all. Wide-area signal suppression seems like a myth in the current war.
Anyway, this is just basic stuff to look into. The tanks remains a "go fast, penetrate stuff, maneuver" platform.
One thing most people also forget is the cost of the firepower that comes with the platform. Smart/loitering munitions are still expensive, and still have a high time-to-target than direct fire or dumb mortars.