Try to take advantage of possible Sapir Whorf effects by constructing your own language to use for thinking in. I got this idea after finding a link here to this New York Times article which has several examples of such effects.

Random brainstorming on potential things to consider including:

• Grammatical evidentiality
• Explicit separation between between epistemic and deontic modalities ("It should work" can mean "It is expected to work", an 'is' statement, or it can mean "It had better work", an 'ought' statement)
• Declining words by how broadly you're using them

It would probably be best to do this after learning at least one other language that is quite different from your native language. Also, keeping ways words can be wrong in mind is likely a good idea.

This would likely also have the same effects as thinking in any foreign language

I may or may not actually try this after I've learned Korean sufficiently well.