Im fairly certain my toddler's have it. I don't want to put them on meds yet so I've done some research.
:Look up foods beneficial to people with ADHD. It'll be foods rich in vitamins, minerals people with ADHD are deficient in, along with foods that prompt your brain to produce the chemicals ADHD brains are deficient in.
:Get yourself on a routine. While your ADHD brain will get bored with it, it is vital to get yourself on a sleep schedule, and some form of routine to help keep your brain from distributing hormones, vitamins, minerals, brain chemicals differently every day because it doesn't know what you're going to do next.
:I'm not too sure if naturopathy is popular in your country, but getting a holistic opinion on how to approach it could also help.
:Research other disorders linked to ADHD. I don't know them all, but ones I have are neurodivergent, DSDP, RSD, Hypermobility, time blindness. Finding ways to manage these will also help.
:Check out Dr. Daniel G. Amen's research on the 7 different types of ADHD. It isn't recognized science, but has helped me navigate my own, and my children's ADHD differently, and in my opinion better than before finding his research.