2. Have the spirit of holding
You will only be able to hold if you invest with your money. If you borrow money, use leverage, whatever source of capital which is not yours own, you won't be able to actually hold.
Loan repayment calls, margin calls, collateral liquidations, etc. will kill you and you will have to stop your hold anytime.
3. Never give up
4. Never be discouraged
It depends on what project or coin you invest in. If you invest in shitcoin, you have to determinantly give up before it is too late. In bear market, altcoins have /100 or /1000 that is not a strange painful fact you can see.
5. Always trade with the right platform
Not your keys, not your coins. It is what people talk about in crypto. That means you must own private keys or mnemonic seeds in order to actually own your coins or tokens. Store them in custodial wallets with which platforms own keys/ seeds, not you then in the end, you don't actually own anything if they pull the scam exit.
https://notyourkeys.org/