How to remedy the bad results of Bayesian estimation?

The result of bayesian estimation is not so good every time. How can it be remedied? Change the parameters?

Without more information it is impossible to help you. There are many possible roadblocks in achieving ‘nice’ estimation results.

GDPQ.xlsx (13.5 KB)
rrr.mod (3.9 KB)
This is my data and my model. Can you take a look at it for me?

See e.g.

Thank you, Professor. I’m gonna go check my data.