I feel you but that's just how Gacha and gambling works; it favours the house. Even with a 3% Chance, getting a +10 of a hero requires approximately $1500; that's if you're lucky. Getting a non-banner is near impossible so don't worry about those.
If you really think about it, 3% is 1 in 33 chance and it will always be 3% on every single attempt. Those odds are close to landing a number on Roulette. I spent 200 orbs to get one 5-Star Hero (Azura) during Hero Fest. Even so, I was happy with that.
My advice is to use this sites "summon simulator" to gauge what it'll feel like to spend X amount of orbs in a banner (or satisfy you mentally.)
If you're having troubles with Camus GHB, there are videos of people completing it with 3-Star F2P heroes on Youtube and FEH Reddit.
May the odds be in your favour.
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