International Google Shopping Ads

I’ve been running UK shopping ads for a few years now and they have been consistently quite good at about 3 ROAS but I started ads in Germany, Ireland, Netherlands and Australia around 5-6 months back first on manual CPC and then now tROAS and I just can’t seem to make them go above breakeven (1.7) whatever I do. I’ve got the Germany feed in German, done negative keywords for each countries campaign, tried different images, tried different targets and nothing seems to help them. If I lower the target, the spend goes up but conversions don’t really and then if I increase the targets, the spend just goes down until it stops getting any conversions. I’m a little stuck so any help would be really appreciated! Thanks😁