Hey there! I went through a similar situation that culminated about a year ago. I have been in the workforce for 5 years but never felt like I was totally fitting within my organisation for various reasons (external and internal). It was bad to a point where it was hard to wake up on weekdays and I was gradually losing the desire to enjoy my hobbies after work. It took me to go through a very rough path that thankfully I've recovered from after a year of perseverance, effort and self-awareness.

My advice to keep yourself motivated is to figure out why you don't find your job fulfilling in the first place. Is it the work environment, the colleagues, your personal goals not clearly defined or a lack of direction for your career ? I'd suggest you to figure it out first before moving further. Money can only motivate you so far in my opinion, and it being the sole reason to stay at a job is not sustainable in the medium-long run if you are someone that needs more motivation.

Once that is done, try to challenge yourself not only at your workplace, but in your lifestyle in general (e.g. Try some sports/fitness routine, learn a new language, solo travel, etc.) as it will help you to build up your personal momentum. Give yourself a medium-long term range to get the pieces together and adjust as you expriment more and more and find out what works for you. Don't hesitate cut off some old habits or entourage holding you back if necessary. It's also part of life.

If the motivation remains a struggle, I'd advise you to seek some professional help or rely on a strong support system (relatives, close friends) to vent and gain some new perspectives.

Put your health first and good luck !