Any pure Carnubas such as zymol in reality are going to only ever last 30-60 days max.
I use Pinnacle Souveran on my car which as a pure carnuba would be lucky to see more than 2 weeks durability, which Brazo found on his car. But as mine car is garged pretty much 24/7 and a weekend play thing - I dont really care and used it for its looks. I do use that over a reasonably durable sealant just in case. ( Bird sh*te protection etc)
I would look into a good polymer sealant, and use the Zymol over the top once in a while to add to the look. With Autoglym Resin and Extra Gloss, Klasse Sealant, or Zaino you may get 3-6 months protection in some tests.
It does add an extra step, polish, sealant then wax, but will give you some decent protection.
For an off the shelf solution give AG resin and extra gloss, followed by your zymol a go. I have just tried out the new Meguiars #21 sealant 182_blue and brazo are selling on mine then a wax for looks.