u/FlameLord050

Hello everyone, I have been running a campaign for about 2 years now and my players have just hit level 8. I am feeling very confident with the system, but when the characters become masters in a save I started to have worries. In this case specifically any how am I ever suppose to hit them with for example a fireball on our swashbuckler and ranger.

So I come to you all, do the monster just get stronger and I have nothing to worry about or is this going to start becoming a very one sided fight?