I think it's important to understand that it's impossible to be constantly motivated to do things. There are some moments when you feel depressed, anxious, frustrated and not willing to continue pursuing your goals at all. You'll seek motivation, but, apparently, it won't seem to be found. The reason is that it is perfectly fine to feel a bit under the weather and empty inside. We're all human beings, so even the richest people in the world can be unhappy. The only thing that has to be done is not your search for another portion of motivation, but search for the reasons why you should keep moving on that were lost. Sometimes it's alright to move towards your dreams and not feel anything special, as if achieving these weren't the purpose of your life. Most of the time, coveted goals require stepping out of your comfort zone, therefore, it is mentally impossible to constantly feel happy and be filled with joy and pleasure. You'll experience ups and downs, but while being on your lowest points of giving up hope don't remember why you decided to pursue your goals in the first place. Think of the consequences of giving up and compare them with the ones of moving forward.
I think it's kind of a life motto for me, but written in a very elaborate way. So, whenever I feel unhappy, I just cut my brain some slack and then continue working. The reason is that I know that my efforts are going to pay off, and my motivation will come along during the process of work!😊🇬🇧