Are there any better alternatives than Victoria metrics for high frequancy data sets i.e. number of events per seconds ranging from 50 to 100 billion ?

I’m afraid only supercomputers or clusters with hundreds of thousands nodes can handle such event stream. The best system I’m aware of that can handle event streams with high ingestion speed is ClickHouse. VictoriaMetrics is a specialized time series database built on ideas from ClickHouse, so its ingestion performance may be better than ClickHouse for classical time series data.