When Sending Ethereum, should I not Adjust the Gas price at all? Does adjusting it Put my Money at Risk? I just "Resent" four transactions on Atomic Wallet to reset the Nonce because I am new to crypto and This is what Happened.

Ok so I just resent four stuck transactions on Atomic Wallet. I had originally put a low gas price thinking it would literally just take a few hours and be done, I didnt know it would just never get dealt with. So now I resent using a slightly below average amount of Gwei, just like 2-3 under the going default so the transactions "completed" in 30 seconds to a minute and a half. However, all four transactions failed....great . I just burned $12 after wasting several days on top. Is this just a crappy wallet? Should I stop sending until I get an L2 Layer going? Would love to know why these transactions failed. I sent directly from my wallet to a Coingate operated vendor . Thanks