I've been using Plasma for about 2 years now and one thing I've never really done is theme it. I use openSUSE and I just use the included dark theme and I don't find it that good. It doesn't look very professional and I sometimes find I can't see buttons because they're too similar in shade to the surrounding area. I've looked through the themes and I don't know if it's an openSUSE or KDE thing but there don't seem to be that many and some seem to give me problems when updating.

Can anyone share some success stories or inspiration? Where do I get decent themes from and which are the good ones? I know I won't be popular for saying this but I think Windows 11 is the best looking OS available right now and I'd like something that feels modern and sleek like that. Are there some tools I need to run fancier themes or make everything look better?