My coleus (I'm pretty sure that's what it is, but might be wrong, I'm no plant expert) went from this (left) to this (right) over the winter. I repotted it when I got it, and have had it in a west-facing window since I got it, as I figured it needed sun, but I also live in Denmark where it's cold and with too little sun from October to April. I water it once a week and started using plant fertilizer a couple of months ago since I was told it's good for spring, but nothing seemed to have helped. It looks dead - can it be rescued? Any tips? Thanks in advance <33

probably dead... looks like it got watered too much...
under watering is preferable to overwatering...

never say die... it's possible some growth might return from the roots, if you were determined to save this particular plant...

You can take a cutting of that big stem on the right and any other small step that are still firm and re-root them. Coleus root very easily. Just stick them back into a pot of fresh soil, and in the future, don;t overwater. Try to make the soil lighter and less likely to hold water by adding perlite