Tax bracket & IRMAA increase advice

Since Congress has approved the Windfall Elimination Program and backdated to Jan 2024, I am getting 2 years of extra income this year and that will get my IRMMA pass the standard $106K -$212K for 2027. 

 

The next IRMAA level is $212K-$266K.  My 2024 AGI is $198K which I believe is  still under $212K MAGI.  

For 2025, since I cannot get pass the standard IRMMA lower limit, I may as well do some, say, $50K Roth conversion to bring my MAGI under $266K.  I am aware of higher tax bracket and need some advice what I need to look out so I will not get over the IRMAA $266K limit.

What are the other source of income that will have to add to my TAXABLE income to derive to my MAGI.  Thanks