Raining and catching fish

[Bad Curry]

Hello!
How to improve chances of catching fish while it is raining?
I usually don't catch anything especially in spring and fall.
Before and after raining is not as bad as during raining.

Still haven't caught a fall season walleye after all these years of trying. The weather is likely to be wet for the rest of this soft water season.
The problem is likely location related but still, what's your advice on fishing in the rain in Ontario.

BTW, I mostly fish rivers, not lakes.