Joking, but also serious. The more you try the harder it is, but you gotta try right? Paradox.
In the meantime maybe break it up. Plan a day ahead, then maybe a week. Go with that for a bit. Maybe you’ll eventually start planning farther ahead, or maybe you’ll find contentment with a bitesized scope. I don’t think there are any hard and fast rules. But above all, be kind to yourself.