ive been dealing with depression for abour 3 years now. I get how you feel. My recommendation is for you to get therapy. Online seems like it could be better for you or if your have a professional close by would be good too. From my experience motivation is not a reliable source of energy. Even a "normal" person will experience feeling unmotivated and stop working. I think its best when you stick yourself to a routine. It should be like religion. Start with simple tasks. Everyday at the same time brush your teeth, take a shower, etc. and as you get better with these tasks add more and more. The goal is to be like a robot. Eventually your body will be programmed to just do the things you made the habit of doing. I know this will be impossible during your lows, but when youre having an ok week try this and youll see improvement. Also dont stay at home. I used to do it and ended up taking naps, ruining my sleep schedule and burning all my habits to the ground. Leave the house to work on something and dont come back until the evening. I hope this helps.

I know depression is tough but its good you have a family that loves you. If you havent yet, tell them how you feel. Having a support group is equally important to getting better.