The most promising idea is to exploit your interpersonal instincts: trick your brain into thinking someone is there. This has benefits for social extraverts

It may also have benefits for people who want to be more comfortable in social situations. For instance, if you used tulpa techniques to hallucinate that a crowd was watching everything you do, public speaking should become a lot easier (after some time). But it would probably be a lot easier to just do Toastmasters or something.