Take care of your domain name and protect yourself from its loss. Remember about a few simple rules:
Do not let your domain name expire, pay for its consecutive billing period. Please note that you may renew it at once for 10 years. You can check the date of the end of a billing period in the WHOIS database.
Be sure that your contact data, in particular e-mail address, stored in the .pl registry, are up to date. Information on any changes should be referred to a registrar.
Change a registrar if the current one does not suit you.
Remember that, as a registrant of a domain name, you have your rights.