There are no restrictions for the .NL TLD. Anyone can register one and they are served on a first-come basis.
The transfer requires an EPP / Authorization code that you can obtain from your current domain registrar. There is no minimum time limit that must have passed since registration or last transfer.
|Privacy rating (GDPR)||
The registry is EU based and your data protection rights are secured. By registering under this TLD you hold the right to become forgotten (data erasure). Your contact details will also not be exported to a 'third country'. In summary, you are safe and hold your fundamental privacy rights. You're good to go.