did you manually change the config files for apache? then there probably is a problem or something got overwritten during the last update.
as @eris suggested, you need to check your logfiles or try restarting apache2 an run journaltctl -xe directly afterwards which might hold more detailed information on the error. we simply can’t diagnose that from here for you
you need to figure the real problem by researching the log files or getting more information by looking at journalctl as suggested - magic eight ball is out for maintenance, so I think you need to do it all by yourself
closing this up here. enough advise has been given, please solve YOUR issues using YOUR sysadmin skills and knowledge. we can’t further support with things that are clearly not related to Hestia anyway.