Hello and
Your words sound so familiar... we are all looking for "motivation" and I will repeat again what I often say. Motivation is highly overrated... we have to make a *decision* and stick with it when our "motivation" fails.
You have expressed well what I think a lot of us experience... we start off feeling upbeat and positive, and then it fizzles and gets boring. We can't rely on our feelings; they are too fickle.
That is where this forum helps, though. We are all working together, and here to encourage one another. There are a lot of threads here which help to make losing weight FUN... sharing our NSVs (non-scale victories), funny moments (someone's too big pants falling down)... and challenges, such as exercise challenges, check in threads, etc.
I wish you the best. Join right in. A lot of us are doing this, and you can too!