Create a Culture Where Long-Range Attacks are Considered Cowardly
One of the reasons we don't use tanks much anymore is that the countries that can afford tanks would prefer not to put their soldiers in harms way. Why use tanks or soldiers when you can use drones or missiles fired from planes that your enemy is unlikely to shoot down?
However, if the culture of the world were one such that it was universally considered "cowardly" to attack from a distance then suddenly you're looking at a lot more soldiers on the battlefield. At that point I can't think of a reason for tanks not to be involved (they are still filled with people and are therefore not "cowardly" weapons, just good tactical choices).
Also note that terrain that makes tanks feasible is also necessary. Fighting in mountains or jungles is not conducive to tanks, nor is guerrilla warfare. So maybe another point to the culture is that it is cowardly to attack-and-run.
Edit II - Clarifying Points based on OP Comments
Let me clarify my points a bit.
By creating a culture that believes anything worth fighting over is worth fighting in person you remove planes from the battlefield (at least most of the time) and any weapons that are fired from a considerable distance. Those are considered "cowardly" attacks because they do not risk the life of anyone pulling the triggers.
(note: I am not saying aerial combat is "safe", just that it is substantially safer than being anywhere on the ground... well, unless you count the surprisingly frequent crashes on takeoff/landing - particularly in that era - which I think we can assume are not considered as part of the cultural definition of "safe" combat).
At this point your wars are waged with a lot more soldier presence. No more advanced scouting with planes/helicopters or clearing paths with huge bombardments from the rear... no, you're running forward with guns held high into the unknown.
At that point you need to find ways to limit losses to your side while still inflicting more damage on the other guys. That screams for tanks. And because anti-tank weapons are readily available they are still vulnerable, so they don't get the "cowardly" trigger.
As pointed out in the comments though, for obvious reasons guerrilla wars and wars fought in jungles/mountains won't see much/any tank use. That's just not what they're for. Fortunately, without ICBM's stopping superpowers from fighting there would probably be a lot more large-scale/active wars to write about.