Keeping a personal diary has proven to be an awesome entertainment. I tend to forget many things over time. Particularly during challenging or memorable experiences, I often forget how I felt and what thoughts occupied my mind. Taking the time to relax and read about interesting weeks from the previous year feels like immersing myself in a novel written by a complete stranger.
If you have an inclination towards writing, I encourage you to give it a try. Personally, I used to dislike writing, but once I started, my perspective changed. If you don't get yourself to like it, then do something else. Some people think the best while walking, others need to talk to a themselves or friend.
I must mention that writing and reading in my native language have significantly improved my speech. I used to struggle with finding the right words during casual conversations and often ended up rambling. Now, uncommon words come to me effortlessly, and now I usually assist others in finding the right words when they're stuck.
I think LLM are great for getting feedback, specially in other languages. You can ask the bot to rewrite one difficult paragraph and study the differences, or check if a native would use the same words you wrote. It's great for learning and experimenting.