Considering you used etc. in your post, that means that everything possible is included on the hypothetical list. So technically, I cannot provide an answer.
If not, repeat step 2 until it explodes. Which it eventually will. Use at your own risk. Not responsible for crashes or computer meltdowns due to needing to place massive amounts of TNT to finally get it to explode.
ect.lightning or creepers.So how do you do it?
Sorry about the ect! (I thought you wouldn't try to mess up my post, but of course you still did.)
I mean I saw someone in a server just hit it. When I did it nothing happened.
^This
A luckily placed lightning strike!
Yeah it is, but still an indirect way. Lava also creates fire, and redstone is under the OP's list of ways not to include.
-Redstone
-Flint & Steel
-Lava
-Lightning
-Fire charge (why did no one say this?)
You like listed all the ways to do it in the description...
By that I mean placing it next to fire in the Nether where it occurs naturally.
Use that in front of said tnt
But what about a lightning strike hitting it?