iirc snowden has some opsec type guides and recommendations, but a lot of that is probably out of date now. No one would really know how to avoid them except the people who work at those agencies and know the full extent of their surveillance programs.

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Continue as usual. Waste their time.

I’d get those sunglasses that have little mirrors in them so you can see who’s sneaking up on ya

I’d consider whether I’d done anything that warranted (in the views of such an agency) such surveillance. If I hadn’t, I’d wonder whether, actually, whatever causes me to suspect I was under surveillance could be explained by something else (Occam’s Razor and all that).

It would be safest to not use any network communication at all. Also make sure that your convos are not being overheard obviously.

Which three letter agency do you suspect?