Volunteer at a place if you can. Spend time in a community completely different to your own. If you have the means, live as a normal person in a country (i.e. not tourist insulated in a community of speakers of your own language) for 3 months (common tourist visa/waiver length), best if done in a country culturally different to your own. If you can’t do that, at least learn a new language and consume media and interact with people (generally free these days).
Volunteer at a place if you can. Spend time in a community completely different to your own. If you have the means, live as a normal person in a country (i.e. not tourist insulated in a community of speakers of your own language) for 3 months (common tourist visa/waiver length), best if done in a country culturally different to your own. If you can’t do that, at least learn a new language and consume media and interact with people (generally free these days).