Anyone else deal with slightly elevated liver levels?

I have been working with my vet on this for over 6 months now. This was my cats first blood test during his physical (new vet) and he had slightly elevated liver levels (~180 ALT). Since then we have done and bile acids test, tried prescription food, had him on liver supplements (denamarin) forever and his levels have fluctuated slightly (never back to the normal category) but we are back to where we started after all this work. His bile acids test was normal. Next step is ultrasound.

He has never been acting sick, eating normally, etc. The only reason I found out was the blood test at a checkup .

I am just worried every test will come back normal? Do I need to see a specialist? Does anyone have a cat that has been through this and you found out the secret to figuring this out? Any ideas are welcome because we are both ready to be done with this 😩