I ran pacman -Syu to update all packages and after that I could not boot into login manager (using linux61 ).
I installed latest linux kernel and reinstalled nvidia drivers, this time I used linux65 and nvidia 535.98 and I could boot successfully. Then I ran yay -Syu and I could not boot into login manager after that. How do I go from here?
The modules are probably not built for rc-kernels.
Remove 65 and boot your last working kernel.
Welcome to the forum! 
FYI, linux64 is the current stable kernel. linux65 is the mainline kernel which is still a RC (Release Candidate). See kernel.org
We neither know from where you started let alone how you arrived at where you are.
Please see:
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