But profit is not always guaranteed in staking. I mean, you can stake and lock up your coin and miss out on good selling opportunities, which you could have made good profit compared to what the staking reward offers you + the current price of that currency.
About staking your coins, it is better done during the bear season when you know that bull is not expected and by that time you won't be under pressure to unstake. If you are not sure to wait long, you can stake for a month and by that time you won't miss out in the bull because bull season don't happen only for one month duration. But I think it is a guarantee for you to make some money from staking your coin no matter how small it is because you have a percentage you get from your coins and if you sell it, it is still some profit despite that it can be small. If you are not sure of missing out of the bull, you only stake for short term.