There are many ways to develop and maintain your confidence and your motivation. Some are easier than others but they all require that you do some work.
This work is not really difficult but depending on your mindset it could take time for the results to show up in your life.
This is not to say that you should ignore developing your confidence and your motivation and just sit on your couch in your comfort zone. This would be a mistake as when your confidence and motivation are high and sustained, you are almost unstoppable in achieving your goals.
Learn some of the simpler methods that you can start to put into place and get yourself moving to having the success you desire and deserve.