There are a number of tactics but it boils down to creating situations where the other actions are necessary to continue to fight effectively.
Here are some examples.
The Dodge action:
"On the far end of the room is a large repeating crossbow attached to the wall set to fire on you as you approach. The cultists are continuing the ritual, daring you to cross the runes before you. Everyone roll Initiative. [sets up Initiative order]"
"Can I identify the runes?"
"Roll Arcana. [Sees 24 result]. You know these runes are proximity runes likely to set off the crossbow when you pass them."
"Alright, I take the Dodge action so the bolts will have a harder time hitting me and cross with my weapon drawn."
The Disengage Action
"As the archdevil starts to bleed from the beating you've given it, it glows a bronze color and your weapons start to bounce off of it. At the same time fire bursts out of the fiend. Everyone in 10 feet, make a Dexterity saving throw."
[Rolls are made] "You all avoid damage for now but the bronze aura has only faded a bit, and small flames start to appear on his skin once more. Your turn."
"I use Disengage to get away from the fire and duck behind the altar until the bronze thing is gone."
The Help action
(This one is already very useful in situations where a person has run out of resources like spell slots and can grant advantage to a more useful ally, or to cancel out disadvantage for your big damage dealers)
"In this magical fog, you can't quite make out the enemy. You all have disadvantage on your attacks."
"I run up to where I hear the enemy move and use the Help action to advise my ally where to shoot his bow."
Show don't tell
If they still don't use these tactics in situations that warrant it, have an NPC demonstrate their effectiveness with them (either an allied NPC or an enemy if possible).
Sometimes players are just ignorant of how effective other types of action can be at no fault of their own.
