Holding my coins on the offline wallets for long-term holdings. I think offline wallets are best for holding coins safe. For short time holding and trade, I hold my coins in different exchanges.
that is the most secure way of holding coins storing it on the offline wallets like hardware wallets, I have a worse experience in storing coin in an exchange, the exchange delisted the coin that I am holding for almost a year so it is not advisable to store coins in exchange for holding.
If you do so you will be forced to keep monitoring your assets, just like what happen to you mate the coin got delisted if you monitor the coin movement you will be able to avoid or you will be able to transfer your coins to another wallet or exchange where you can safely monitor it again, but experience will made us more furious in terms of securing our assets as it is our hard earned money which we need to be well kept.