Tichu is high variance (lots of luck) and winning can often come down to maximizing the limited opportunities you have to score points and minimizing what opponents' points even when they have the better hands. So decisions about what to pass and play, when to bet and how aggressive to be (risk versus reward) can be divisive because so much can ride on any given decision.
That being said, there are always new players jumping in. Start tables and limit players to Average or even Apprentice and below. That should be a clear indicator that those at the table are likely new to the game. When you're at 100 ELO/Average, avoid joining the tables with two high-rated players lying in wait in seats 1 and 2 for 45 minutes at a time. Those folks rarely play each other and prey on unsuspecting random noobs for marginal ELO gains. You're not likely to win given the distinct advantages of their play experience, willingness to be aggressive, and familiarity with their fixed/regular partner.
Don't play arena until you're comfortable with essential strategy and can apply in game since arena players generally anticipate skilled partners and opponents. As far strategy,
this is a good read to start. You'll find that disgruntled partners may offer unsolicited criticism of your play. It can be hard on the ego but as long as they're not getting personal and sticking to tactics and strategy, try to find some value in it, recognizing that at some point—should you keep playing—it'll inevitably be you dishing out frustrated feedback. Perhaps you'll even make a friend who becomes a frequent partner and you can setup your own trap and wait for random rookies to think they're good enough to take you down.
Have fun.
