What do you do when you feel unhappy in marriage?
If you are unhappy chances are that you are half to blame.
Marriage is a two way street. Both of you need to work at it. But here is the problem. Many people look at their spouse and think to themselves that their spouse isn't giving a 100%. So they themselves don't.
Or they accuse their spouse of not doing as much.
Essentially you compare yourself to your spouse. And ultimately that leads to unhappiness. You and your spouse are not equal. Yes, it should be an equal partnership, but capabilitywise you are not equal and never will be.
The solution to this is to always give 100%.
But communication is also quite important. Giving a hundred percent is meaningless if you are putting that effort toward the wrong things. Take the 5 love languages test online and see how your spouse likes to be loved. Share with your spouse how you like to be loved.
These things take time to improve. Be patient and don't judge. Just work on you.