How to plan the database split for an application with more writes and reads? (cause the hard limit

How to plan the database split for an application with more writes and reads? (cause the hard limit for a db is just 10 GB)
1. create databases with limited number of releatable tables
2. replicate the whole db structure, scale them horizontally and query them using the workers to map the right db
3. Please answer

which is the best practice? what does cloudflare recommend?
what's the next best alternative for this ?
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