It's normal. It takes time to incorporate new knowledge. Blitz is only for the stuff you have in long term memory.
Studying more but becoming weaker. Why???
My chess com rating at blitz was 1700 a couple of months ago. I started studying endgames, reading "My great predecessors ", solving hard tactics and things like that for 2-3 hours a day. Now I keep losing and losing and my blitz rating is 1620. Please can someone explain why this happens because its really demotivating.
This is, in fact for many people, only the starting component of an eventual increase in rating points.
Think of melting ice. When ice cubes melt, their volumes decrease momentarily for a short temperature increase. After this temperature (of around 4 degrees Celsius), the volume of the water starts to increase again.
It takes time, but within one year and constant practice, you would most likely read this page once again as a higher rated player.

Think of melting ice. When ice cubes melt, their volumes decrease momentarily for a short temperature increase. After this temperature (of around 4 degrees Celsius), the volume of the water starts to increase again.
This.... is the exact opposite right? And part of what makes water so interesting.
The initial moment of unfreezing actually sees an expansion in volume, but overall as water melts it becomes more dense. Ice has higher volume than water... which is why ice floats.
I have found this as well at points. It seems like after learning things I get worse first and then explode to higher than I was.
Think of melting ice. When ice cubes melt, their volumes decrease momentarily for a short temperature increase. After this temperature (of around 4 degrees Celsius), the volume of the water starts to increase again.
This.... is the exact opposite right? And part of what makes water so interesting.
The initial moment of unfreezing actually sees an expansion in volume, but overall as water melts it becomes more dense. Ice has higher volume than water... which is why ice floats.
Oops, mixed "volume" up with "density".
My chess com rating at blitz was 1700 a couple of months ago. I started studying endgames, reading "My great predecessors ", solving hard tactics and things like that for 2-3 hours a day. Now I keep losing and losing and my blitz rating is 1620. Please can someone explain why this happens because its really demotivating.