The important thing is to find an alternative to your usage of the tool, not to the complete tool i think :)
For example if you don't use the sharing capabilities of Google Calendar you don't need an "alternative", you just need a calendar app (Nextcloud is good to sync it) :D
In the same manner if you just need a map (on a website for example) OSM does a good job.
Thinking about this matter this way helped me a lot to find real new tools that fit my needs :)
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The important thing is to find an alternative to your usage of the tool, not to the complete tool i think :)
For example if you don't use the sharing capabilities of Google Calendar you don't need an "alternative", you just need a calendar app (Nextcloud is good to sync it) :D
In the same manner if you just need a map (on a website for example) OSM does a good job.
Thinking about this matter this way helped me a lot to find real new tools that fit my needs :)