Proverbs 26:20 KJV — Where no wood is, there the fire goeth out: so where there is no talebearer, the strife ceaseth.
If you’re not feeling the passion and heat that you used to, you probably need more wood.
The spark comes from the fact that you still care and have even noticed that things aren’t as they used to be, and it bothers you.
Fuel this spark with the Word. Fuel this spark with things that feed it and make it bigger, rather than things that snuff it out.