Always set goals for yourself, it is never too late to improve yourself, or hone a skill. Add to your already accumulated skill set, or improve pre-existing ones. There is always room for improvement. Always another star you can aim for.
If you find yourself saturated (or the environment around you saturated, and you can’t get a foothold) move to greener pastures – if you are the best at something in one place, chances are there will be something new to learn in a different place, even if you do the same thing.
Get another degree (something which I am trying to do), study a new culture, learn a new language (something I am currently working on!) get a new hobby (like photography? cooking? Blogging!) Move to another town, another city, another country – see how another part of the world does it’s business. Read a new book – finish it and pick up another one, go through a personal list, then go through someone else’s list – make new friends, meet new people. Make a mistake. Learn from it, move on. Do not be afraid to make a mistake. Share your knowledge (yes, you have it!) Pick someone up from where they have fallen. Help them if you can. Surprise yourself with how good it feels, and how easy it is to make someone happy (or just less sad).
Be the best you can be, and then strive for even better than that.
Always improve. Always be open to change. Always be open to suggestion to make yourself better. Always be humble enough to know that there is always room for that little bit of change, however hard you try to fight it – you will end up being a new ‘you’, very likely for the better. You are your own best investment. Do right by yourself.