Think about your return / the next stage
Many researchers return to their original scientific network to seek employment after the postdoc - or even sometimes before it is completed - especially in the human and social sciences.
The greater your visibility, the less likely you are to be forgotten during your absence. This is why more experienced researchers advise postdoctoral scholars to showcase their thesis where possible prior to departure, by forging as many links as possible with research groups, participating in colloquiums, offering to come and present their results, etc.
It is very important to maintain these links during your absence. Suggesting collaborative projects, writing an article with a former colleague, maintaining informal links, etc. are among the possibilities available.
There are also often possibilities of applying for posts in the host network and, of course, elsewhere. Distribution lists are excellent resources for keeping informed.