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you should not call method with -Async postfix with Task.Run()!! - thus you create async method twice in ThreadPool, that is unnecessary. - e.g. in var users = await _dbContext.Users.ToListAsync(); ...

Use Polly Rate Limiter, with Concurrency Limiter configuration you can create separate thread pools per use case you can add new tasks into the pool at runtime, during execution, not just at pool ...