There are a lot of great ways to nurture your brain function and keep your ADHD at bay without resorting to meds. Try and limit your social media usage as much as possible, ideally none; personally I haven’t used TikTok since like 2021 and I’ve felt infinitely better because of it. Also look into cold plunging, it’s been proven to increase dopamine levels, short term it’ll make you more energised and happier for the rest of the day, and long term use will make you overall happier just in general. Your habits also play a really big role, try to limit the amount of instant gratification you’re getting regularly (I.e. social media, candy, soda) and replace them with other things that dish out that gratification slowly, or not at all until a difficult task is finished; these are things like reading a book, exercising, legos, and basically any hobby that takes hours to do. These things used in conjunction with one another should yield an overall healthier brain and by extension a better mood in your life