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2. Remove counterattacks. In theory, you could introduce this change now by giving everyone counterattack, but that's not ideal either – a small number of units with counterattack wouldn't hurt. Why? It immediately eliminates annoying tactics like focusing, and improves the dynamics. Well, in theory, of course, but such a theory is worth testing. Moreover, this type of game modification is reversible – if you don't like it, you can give all creatures the "counterattack" skill and everything will be exactly as it was.
4. By the way, it would also be good to modify the formula for calculating damage from creature spells. Ideally, give them different spells that don't match the hero's magic. The a-la hero magic formula doesn't work well for them.