Fala cara, já tentou fazer essa pergunta em algum subreddit? Geralmente tem muita coisa por lá e a galera interage bem.

Edit:
Alguns links que encontrei jogando a sua dúvida no reddit:

https://www.reddit.com/r/n8n/comments/10pu3a7/self_hosted_oauth_redirect_to_n8n_server/?tl=pt-br

https://www.reddit.com/r/n8n/comments/1dnius2/problem_with_oauth_and_self_hosting/?tl=pt-br

https://www.reddit.com/r/n8n/comments/1gm0uy6/beginner_seeking_advice_best_setup_for_self/?tl=pt-br

https://www.reddit.com/r/selfhosted/comments/zks324/simple_useful_apps_that_you_selfhost/?tl=pt-br

https://www.reddit.com/r/selfhosted/comments/sjw0zx/n8nio_selfhosted_opensource_zapier/?tl=pt-br

https://www.reddit.com/r/n8n/comments/1gm0uy6/beginner_seeking_advice_best_setup_for_self/

https://www.reddit.com/r/selfhosted/comments/sjw0zx/n8nio_selfhosted_opensource_zapier/

https://www.reddit.com/r/n8n/comments/1bc5ku3/i_cant_make_https_requests_with_httplocalhost5678/