I had the same thing a few years ago after sliding out three times in the wet. I had cheap tyres, and switched to Schwalbe pro ones, which seem to have more grip in the wet. It takes a bit to re-gain confidence, but it’ll come.
The other thing that might have happened has to do with tyre shape - I used to run 35mm tyres on narrow-ish rims, and I think the bulged-out shape meant the bike cornered a bit weirdly. There was some sort of tipping point, over which it lost grip rapidly. I don’t know how wide your rims are, but if you’ve recently changed to wider tyres, that might also be an issue?