Optimism is closely related to trust, and it is more practical or applied than hope. It is grounded in you doing your part, and in others doing theirs. Your assumption something is going to turn out fine (or at least not a complete trainwreck).
When you have a goal, something you want to be, to get, to experience, optimism makes it a lot easier and smoother to get there. A lot less fighting of things you have very little control over (like other people, the universe etc).
Optimism is also trusting your own capability to pivot, or to bounce back if things don’t work out exactly like you planned (for most key big innovative things or things that involve other people, they rarely work out as you planned. Often they work out far better).
Optimism does not mean being delusional or not doing due diligence as needed. But it means you don’t have to have the whole journey mapped out to do step one. You just need to know if the next step takes you closer where you want to get to, and then go that next step. And then the one after that.
What is one thing you can do today?