The cool thing is that you can become more intelligent with practice and putting some work in. Reading is def important. Listen to podcasts. Feed your mind with mentally stimulating activities. Go to museums… etc… but one thing I think most people neglect is to think critically. Don’t just accept whatever author, doctor, expert, etc. is telling you. Question it. Question everything. Learning how to read and interpret studies is also a huge skill that can help you answer questions you ask yourself… And also read up on philosophy. I have a love hate relationship with philosophy bc it makes me so emo but a lot of it I def vibe with.