If you are comfortable with bit of programming, then you can use Java script libraries likeHopscotch or Joyride to create guided web tours.
If you are looking for a ready-to-use solution, then your best would be to use the UI based walk-through builder - Whatfix.
Whatfix will help you create real-time interactive walkthroughs on any web platform using its easy-to-use extension. It can be used to give users tour of your website, onboard new users or employees onto your platform, train them extensively on particular user based tasks and also used as a tool to for help and support.
It is simply the best WalkMe alternative in comparison to performance as well as the budget.
To give you a gist of how it looks like, here’s a GIF of Whatfix’s interactive walkthrough (and self-help widget) on Service Now.