PayPal may hold or restrict your account activity if they need more information from you about a transaction, your business, or your account activity.
PayPal puts money on hold to ensure the platform is safe for buyers and sellers. Your PayPal money might be on hold if you're a new seller or your account has been inactive for a certain period of time.
The initial payments you receive can be held for up to 21 days by Paypal. This is a common industry practice to cover any potential buyer complaints that may happen at that time.
You can take a look at Paypal related information here.
Alternatively, for future payments, we suggest you change your "Payment Method" to Bank Transfer, as you can avoid this turnaround time and also service fees charged by PayPal whenever you withdraw money from PayPal.