# In casual games with a lives system, the key is to play as slowly and thoughtfully as possible, not for speed. Before each move, look at the entire board and search for chains that'll create combo effects: matches of four or more elements give you special items (bombs, lines, crosses), and those work to clear whole zones. One correct move with a special item can replace five regular moves. Don't rush to tap the first option you see - there might be a better combo slightly higher up on the board.
Second thing - learn to read the level right from the start. What's the goal: get rid of blocks, collect certain elements, free up pieces? Blocking elements (ice, stone, chains) should be broken with special items first and foremost, not wasted on empty work. And make sure you play levels when you're focused, not in a hurry - carelessness costs lives dearly.
If you really hit a wall, don't look at in-app purchases. Better to put the game aside for a day or two, switch to something else, then come back with a fresh head. Casual free-to-play games deliberately design "walls" to make you wait or pay, but after some time the level suddenly passes because you see its combo in a completely different way.