If you haven't played a game in a while, the controls can take a bit of time getting used too.
Practise, practise, and more practise is key. Learning specific tactics and strategies is vital.
Most video games have walk throughs, FAQs and tutorials on their websites. Also, you can buy strategie guides on Amazon, eBay and other online retails although this is usually a waste of money so trying looking for free guides.
Many content creators upload Tutorials which give you hints on how to improve. Have a browse on YouTube and various other social media platforms for tips.
Of course, you can always ask me for help. Don't give up and keep trying to improve.