Best Detox/Diet?

I used to eat low carb and lean and I felt pretty good but the last couple months I've been eating terrible and my stomach had noticed. What I ate before was super boring and plain which is probably why it failed. Before I actually go back to clean eating/ dieting I want to hear your opinions on the best diet and best detox. I am thinking about doing some kind of detox or cleanse before I start back up.