What is the data that is most important to you, and therefore to a person who would be looking to take it? Is it data about your identity, online accounts or about your contacts? If your data is scattered between your pc, mobile, and online accounts, can you organize it better so it's safer? What would you do if you didn't have access to it?
it is good to think about that so that you can put down some simple notes to better organize it, and check whether it is as well-protected as you want it to be. If you don't feel confident in your security, then look online for some tips and check what it would take to put those into practice.