There can be several reasons for an account limitation: An unauthorized person may be using your account. If PayPal believes someone is using your account without your knowledge, the account could be limited to protect you from fraudulent charges while PayPal investigates the suspicious transactions.
PayPal puts money on hold to help ensure the platform is safe to use for both buyers and sellers. Your PayPal money might be on hold if you're a new seller or your account has been inactive. To help release funds faster, add tracking information to your orders or print a shipping label via PayPal.