If Krishna is pleased, you will feel pleased. This is automatic. If you are not feeling happy, that means Krishna is not happy by your service.
“Sa vai pumsam paro dharmo”, Unless we get pleasure, we can’t do it
The Happiness that we get through material things is very transient. Therefore, intelligent persons seek for permanent happiness.
Real happiness is in service. Accumulation does not satisfy the heart.
Spiritual life is not dry, it is also exceuted happily, 'susukham'. The result of that is not just happiness, but bliss, spiritual joy.
If you want to be happy in this world, then “STOP” searching happiness in this world.