How do you guys make new vocab stick for good?

Hey everyone! I'm Oliver, and I'm super pumped about learning, but I keep forgetting words after a few days. It's like my brain just resets! I've tried simple flashcards, but I'm looking for something more active. Do you have any wild memorization tricks or ways to use examples so you don't get bored? I want to make sure these words actually stay in my head long-term. Any advice for a beginner?