@Karsten , Welcome! I like your profile and your pics, including those from your childhood. What you need to get started are character references. Ask at least three, or better, five or more people who have known you for a while, the longer the better, to write letters of recommendation. Also ask those whose pets you have watched to write you a reference. Then, apply locally, short duration, last minute and offer to meet them ahead of time, when possible. Here is some reading material for you.
(https://forum.trustedhousesitters.com/t/nobody-wants-me-advice-for-a-first-time-house-sitter/
Have faith, it will happen!