Just a few selected observations.
You just need to accept that this is a very tough game and its not suited to many gamers, in fact thats why many of us enjoy the challenge of it compared to others, if it were easy or the challenge reduced i would probably move on to something else. Its a game that you play for years not weeks or months, its a few hours a day game not a few hours a week I can understand some being frustrated at the pace of it being too slow for them when its the most detailed fishing game currently available.
That said player numbers in rf4 are extremely healthy for such a tough game, steam figures are consistent (and maybe half the player base use the standalone client that steam stats don't cover,) twitch figures are equally healthy compared to other fishing games, in china there are often 70 or more players streaming rf4 at most times, the russian streamers have mostly moved to trovo
The early levels can be painful but it very much depends on whether you're enjoying the fishing itself, its a grind when you're not enjoying the fishing and stuck doing the same thing week after week rather than mixing it up a bit.
I strongly believe rf4 should be far more imaginative as far as cafe orders, there seems little good reason to have such limited orders per cafe.
I would be very much against being able to use more than 3 rods, as for me it would turn this game away from trying to recreate recreational pleasure angling to almost commercial fishing.
Fish smart, use every online resource you can, which means being in an active in-game chat channel and likely their discord community, don't waste silver on food or superfluous items, do every single cafe order you can... even at my level and 400k+ silver, i don't pass up even a small perch order, i regard every order filled as a little victory
The community is everything in this particular game, something that rf4 needs to acknowledge and be extremely careful when anything they do impacts that. Most higher level players will not hesitate to send 2 or 3 basic feeder kits and other tackle/baits to a new player.
Your issues are a regular sight on the forums over the last 4 or 5 years but the bottom line is that it may simply not be the game for you, and most games have players that drop out through frustration fairly quickly, games like rf4 start with a vision and they tend to stick to that through thick and thin.. when it gets very thin over a period they may change but that will often lose them more players than it gains.