>>936873475 (OP)stop drinking, it makes you dumb. Avoid eating seed oils, they cause inflammation and contribute to insulin resistance which makes you dumb. Avoid things like porn or short form content on youtube and tiktok, they degrade your attention span and make you dumb. Stop jerking off.
Learn a new skill or craft, like building something or playing an instrument. Practicing a new thing makes your brain forge new pathways between neurons, which makes it easier to learn future things. Get some sunlight for vitamin d and exercise. Do things that suck to do to build discipline, making it easier to tolerate frustration. When you're good at learning and tolerating frustration, the sky is the limit.