Can you try to take backup of essbase.sec and essbase.bak file. remove those from $ARBORPATH/bin path.
And then try to start Essbase services. (Take backup of whole instance if you want to avoid consequences)
What is Essbase version you are using ?
If it is 18.104.22.168.x , provide your last entries from log console~Essbase1~EssbaseAgent~AGENT~1 available at :-
Check if you any temp sec file in location "C:\Oracle\Middleware\user_projects\epmsystem1\EssbaseServer\essbaseserver1\bin" if yes, rename it and then try to start essbase
also delete the essbase.lck if you find one.
share the status of opmnctl