consider you should fit a good trimm first. Not too short fin, mastbase in the right position, well positioned harnesslines and not too hogh boom position!! Additionally you could play around with you footstrap positions. Get them in outside positions.
Try to sail further upwind than the mark is placed in a figure 8 Slalom race and stay close to the mark after the jibe.
Upwind sailing in general needs enough sail and it helps when you lean your front shoulder forward. Keep the sail closed and try to find the right angle towards the wind. Sometimes it helps to sails less hard towards the wind and when you feel enough power, you can try to win some more meters againstthe the wind.
At the start it should work better staying closer towards the boat.
Hope it helps,
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