I have a fusion at l4-l5 I have a broken screw and another screw that appears to be backing out is there any way to fix my issue?

Yes. You need to determine why the screw broke and the other is backing out. Most likely, you have a pseudoarthrosis (meaning the fusion did not heal). Another surgery may be needed to help re-fuse the area. I recommend evaluation by a spinal surgeon.
Redo fusion. Remove screws redo fusion front and baclk use bmp magnetic stimulation auto iliac crestgraft post op brace no smokiing or nicotine.