Things that you find simple may be something that a neighbour can no longer manage for themselves, like taking the dog for a walk.
Help other people to acquire practical skills that you've developed during your life. You'll learn a lot too!
Keeping somebody company every now and again is something that anybody can do - it'll make a huge difference.
Odd jobs around the home can be a real struggle for some people - you don't need to be a tradesperson to help out!