I like to change to IPv6 and my current ISP can make it happen (Ziggo, The Netherlands). However, I have currently my own externally accessible IPv4 address and

I like to change to IPv6 and my current ISP can make it happen (Ziggo, The Netherlands). However, I have currently my own externally accessible IPv4 address and I will lose that when I opt-in to IPv6 because Ziggo only offers IPv6 with DS-lite. DS-lite means I cannot access my network anymore over IPv4, so I will not change to IPv6.