If you cancel your PlayStation Plus membership you will continue to have access to all of your PlayStation Plus membership benefits until the end of any previously purchased subscription periods. However, free avatars and content you purchased at a discounted PlayStation Plus price is yours to keep.
PS Plus, PS Now and EA Access
Go to [Settings] > [Account Management] > [Account Information] > [PlayStation Subscriptions]. Select the subscription you want to cancel. Select [Turn Off Auto-Renew].
If you cancel your PS Plus subscription, then you'll lose access to any games you've downloaded through PS Plus. If you renew your PS Plus subscription at any point, then you'll regain access to all the games you've previously downloaded through PS Plus.
If you cancel your PlayStation Plus membership you will continue to have access to all of your PlayStation Plus membership benefits until the end of any previously purchased subscription periods. However, free avatars and content you purchased at a discounted PlayStation Plus price is yours to keep.
You can cancel your subscription up to 24 hours before the end of your trial and you will not be charged. You can find details of how to cancel your subscription by switching off auto-renew here.