As 1 shot said buddy at least your out
YouTube is your friend on this mate....full of great tips. Saying that you can try all the tricks in the book and if the fish aren’t biting there not biting
Tidal rivers are a bugger mate. As you said. Snags! Hate them lol. Could be worth it to target the bigger fish that lurk in and around them snags like pike and larger trout. For pike try a large bubble float with about 2 foot hook length and use dead bait. Large trout....get a bouncing Betty or a flying condom! .