I briefly developed a bit of an obsession with AC during lockdown.
Race Department is great for updates on various aspects. Camtools, apps, skins, tracks, filters, etc. The latest Sol weather system is available here.
Assetto Land generally has a few impressive car mods each day. The car section covers most manufacturers.
x4fab is a genius on Patreon. He brings RainFX, extended physics and stunning previews every couple of weeks. £1 a month.
Assetto Club has plenty of tracks available but not updated recently.
This is the car if you want to behave like a lunatic. Choose dusty track, extended physics, no TC and with a little bit of throttle control, it will slide itself around corners.