First try another known working keyboard to ensure that there is no other problem.
If the other keyboard is "ok" then try another cleaning focusing on the misbehaving keys.
Then begin delving deeper into possible key replacements etc..
General idea being something along the ideas presented in the following link:
https://www.reddit.com/r/MechanicalKeyboards/comments/69cpjm/razer_blackwidow_chroma_key_switch_replacement/
Just google accordingly: read/watch and decide what options you like, are willing to try, and go forward.
Simplest and less risky options first. Both are subjective and should be addressed as you deem applicable.