Best ways to stop forgetting new vocab so fast?

Hey everyone! I'm Oliver and I've been diving deep into vocab lately. I'm finding that I can memorize a bunch of words in one sitting, but two days later, they're just gone! Does anyone have fun hacks for keeping them fresh? I'm currently trying mnemonics, but I'd love to hear your favorite tactics for long-term retention. What works best for you when you're just starting out?