Hey,
I will try to help how I can. There really isn’t a great way to do this, unless you use a kill box to stop the particles, but can look weird on sprites. The better solution would be to go into the particle system and change the parameters there to fit your desired needs. Ex: make the sprites lifespan lower, scale everything down (fire already looks too big for the fireplace), etc.
Hope that helps some, let me know if you need help doing those changes.