Instead, I recommend a focus on gratitude. Sometimes this is not an easy task as the positives might only be a silver lining. But when we look hard enough with an intention of finding some gratitude, something to be thankful for, the rewards can be substantial. This perspective is also, often, more under our control and is an active task instead of a more passive experiencing. Happiness can be too dependent on outside forces beyond our control and for which we can not fully take credit. Many think of their happiness as a materialistic possession. And it may be unstable whereas a grateful attitude can be taken anywhere.
I am not talking about positive thinking or optimism which is also important. But perhaps a thankful outlook brings positivity and optimism to us in a more natural and rewarding way.