To get such a mate picture on the board against a 2,000+ opponent (even if “only” in a blitz game), you have to rely on The Dark Knight System:
Those who also like to play online tournaments with longer (classical) thinking time are in the right place in the Lichess group “Classical Weekend”.
The Classical Saturday tournament enters its third edition: The first round starts on Saturday, 13 March at 12:00 (CET). There will be 7 rounds of Swiss system with 60 minutes + 30 seconds increment, one round on each of the following Saturdays.
To register, you first need to be a member of the Lichess group (one click), then you can sign up in the tournament room.