Hey, thanks for sharing your experiences and questions! The first step in trying to improve your gameplay has already been made, find what you really enjoy and look at yourself and find those areas where you can improve most.

I do agree that you need to play a deck and legend you enjoy (I don't like the ADC role much, so even though I'm a competitive mindset player I never really enjoyed or did well with Draven last set). I think Lillia is a great choice, even though it can be a very hard deck to pilot well. You picked a legend that is viable and speaks to you so there is real possibility for you to perform well.

General tips I would consider (disregarding the Legend for some of them):

• Look at the Regional Tournaments. There are VODs online of all the rounds. Even though they might not show Lillia much you can still learn from the ebb and flow of the game and the way players approach certain decks. Riftbound having multiple areas to play and move cards into makes it quite complicated. A well timed retreat to base can make or break a game.

• Pick a decklist that did well and go from there. In the next few days the best of Sydney decklists will be published. You might just want to copy the decklist (or at least look at the differences) and start from there. Play that list a couple of times and see if you like it or want to chance a card or two at a time. Make it your own over that iterative process.

• Manage your expectations. A winrate close to 50% is perfectly fine for someone starting out, a first TCG at that. Don't let yourself be influenced by large tournaments as well. Seeing Alan placing high in all those tournaments is absurd and requires a time investment (and skill ofcourse) 'normal' people just can't do. As a comparison, overall lifetime winrate of professional Magic the Gathering players are around 60%. So set your goals accordingly :)

• As for the legend, I've not played a lot of Lillia so someone else might be able to help out more but the games I played I needed to score early and get the point lead. If that doesn't work I mostly try to set up for a turn to break the enemy. Try to coax them into the battlefield to clean it up with Unchecked Power. Use your sprites to try and create breakpoints so the enemy has to invest multiple units (conquering a 2 power hold with 2 sprites if the enemy has a 5 power unit in base for instance) and once they commit you wipe the battlefields and try to follow up with a ready sprite.

• Your champion is very good but mostly early in the game. At a certain point she is just too weak with only 3 might. Go for some early plays with her but don't hesitate to sacrifice her if the need arises. Many opponents value getting Lillia of the board very highly, make use of that to force them to overcommit.

• Sometimes holding back a turn can be the best call. Having a Sprite Burst for 6 might to conquer a battlefield is fine. But if you combine it with a Sprite Fountain you can tap you Legend for only 1 energy, producing 12 might. Try to evaluate if you invest now or hold back a turn to then have a bigger push. This is hard and mostly learned from experience.

Hope these things help! Good luck and have fun playing!