Sven Bot
Try playing more offensive - It's alot harder to defend that attack and Sven is a personality bot that likes to defend, so if you attack, there's a higher chance you win. No guarantees.
I find Sven really inconsistent, he does blunders, looks like sometimes he's willing to give up some material for no apparent reason, and I've seen him not even defending his queen (although rare). But he's better than me the rest of the time. As a result I will win maybe 1 in 3 games but it's not really satisfying when it happens. Personally I prefer bots to be accessible (for your level I mean), but not do straight blunders like humans can do, it's a bit of a waste of time when it happens.
Play more rapid instead of bullet and get used to using a little time on each move. In the end game, use part of this time to check each of your moves to make sure it doesn't cause stalemate.
DONT WORRY ABOUT PLAYING SVEN.....THSI SITE IS INFECTED WITH THOUSANDS OF FAKER PLAYERS WITH FAKE RATINGS.....THE RATINGS SYSTEM IS SO BADLY COMPRIMISED THAT IS IS UNUSABLE.....AND I JUST PAID A YEAR SUBSCRIPTION ////...theyve been cheating me hard 300 points in 3 days ....losing 28 gales out of 30 when normally i win over half...im a very good player...i was 1500 at 13 years old.........this is bull crap////this is not a fide rating its a pile of dung and false////thiis site publishes false ratings and pretends they are true.......its so very dishonest