Some quick thoughts, depends upon legal form and scale
1.) If an AG or GmbH with shares held by one or few people, might be able to sell. If unincorporated or Einzelfirma, probably can't sell it
2.) If active business with multiple customers, assets, bank account, tax and MwSt numbers, etc, might have value. If just an "concept", or hold inventory but no customer base, sales, etc, probably can't sell as business, only clear goods for what you can get
3.) Some thoughts on "how" assuming you have GmbH/AG, customer base, and registrations (i.e. an on-going concern)
- Brokers: expensive, but can work if you sift the chaff from the wheat. Need to talk to 20+, ask for success examples, might cost you up-front cash and big % of proceeds
- Treuhands: If business is serving very local market (neighbourhood focused) put sign on window and send letter with short profile/numbers to local Treuhands
4.) My guess is by far best option is to identify competitors who might want to sell in CH, people who already know your business, people you've met who say "I wish I had a business like yours", people in your industry/trade groups (via ads), etc and seek to sell into someone you know.
Good luck! If you can share more details, maybe some more concrete ideas will come up from Forum