If one reads my posts prior to the election, the senate was always a toss up for the winner, but the real important one was always the house. They have the committees and the money. IMO the senate would have been good for the GOP to prevent Biden putting in SCOTUS members, but IMO it's unlikely any will need to be replaced in the next two years, so while goody for the Dems, in real terms not that big a deal.
If the Dems do take the house, as they may do, that will be a problem for those of us that think Biden's agenda has to be stopped.