I feel for you so much as you wonder what it is that makes you tick or not tick the way you wish to, in some cases.
I find motive to be significant when it comes to motivation. The motive has to be great sometimes, especially when we're feeling a serious lack of energy. Energy is another major factor but I'll touch on that a little further along. With the motive aspect, if someone was to steal our credit card, no question about us being motivated to contact the bank and cancel the card. The motive: Not to have our account drained of our savings. If someone was to ask for our help, we may not give it a second thought, for the 1st thought - I have a strong desire to help this person - is what motivates us. Personally, if there's little to inspire me, you're not going to get me motivated. If the latest release on Netflix is more exciting than a boring walk I know I should be taking (for the sake of my wellbeing) or more exciting than cleaning the same bathroom every single week, I'll sit on the couch and binge on an entire season of that show in a couple of days. In this case, my motive is to experience excitement. Throw in some junk food and I'm really excited. Of course, there are consequences to this being a regular form of excitement.
Changing perception, can change motivation in some cases. If that walk becomes a sensory experience (sight, sound, touch and smell), it can be an emotional experience, connecting us to life in a unique way. If cleaning your bathroom is done with attention to detail through the senses, it can also be an emotional experience (strangely enough). So, all of a sudden we can be living through our senses, in the moment, stopping to smell a flower we've never taken the time to smell before or listening to the sound of the scrubbing brush rhythmically swirl on the shower floor.
The energy factor is definitely a biggy. If we don't have the energy to move it, no motive will get us out of our chair. Restorative good quality sleep and good hydration are natural energy boosters. Hydration impacts/energises our cells significantly. Also, if you're usually a 'high viber' longing for excitement and your partner is a 'low viber' who's happy to just chill and watch tv, this may be a challenge. For a partner to say 'Okay, c'mon, we're going on an adventurous quest in search of excitement', this may be enough to begin feeling our body's energy in motion. Having a 'go to' person in our life to help us 'vibe up' is important.