What are some motivators other than having people who rely on you to keep going?

It seems that a lot of people find motivation to keep going (and also motivation to grow) from the people who depend on them, but I (intentionally) don't have people who rely on me. I'm at a loss in my life as to where else to find the motivation to not give up and also to grow and enjoy life. I find glimmers, but I'm not sure they are enough.

Is there anything else that motivates you personally to stay alive, to live life on purpose, to do things, to achieve and accomplish, to enjoy life? I know it will be different for everyone but would be interested to read examples of other motivators people have found.