To be honest, if time travel was possible and we could actually do it. Changing things in the past would just create an alternate reality. We can't change things we've done in the past with time travel because there's already a current present if you understand what that means. Everything movies/series say about time travel is pretty much the opposite of what actually happens so if it were me I'd just go back to what I thought was the best year (2016) and just relive it.