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Best ways to get better are arcade battles and Co-op missions. You can’t level up in arcade but it’s really quick to level up in co-op. Sometimes you have to die and lose a lot before you can be as good as people who have been playing for the past 10 years. The campaign will also teach you to get much much better. Some parts of the campaign on Special Forces are almost impossible without a high level of skill so repeating them can help with your reaction time and managing frustration when you die to real people. It may feel like bs at first, but the more you play the more fun it becomes. I would also change your sensitivity and stuff like that in your settings if it makes it easier. You can also toggle aim bot in settings so that is another reason why most people are good at it. Also, it is a cross-platform system so PC players may have more accuracy than console players.