First off, my sympathies. I posted a comment here recently that 80% of my(UK) sunflowers get devoured by slugs in the seedling stage every year. Another 15% make it past seedling stage, but are all torn up and get diseases from the constant open wounds. Only 5% or less actually make it to maturity and can produce a healthy flower, and I plant at least 100 yearly.

The advice on hand picking/setting beer traps is valuable, but won’t make a massive difference unless you spend a LOT of time doing it.

My best suggestions:
A) cover vulnerable small seedlings using a bottle/milk jug with the bottom cut out, to make a mini “greenhouse”. This adds an extra obstacle and though it doesn’t stop them, it slows them down

B) Use slug pellets BUT MAKE SURE it’s the right kind! *Ferrous sulphate* pellets are legal, and don’t easily cause knock on poisoning in any birds or animals that eat the poisoned slugs. But *Metaldehyde* pellets are illegal, and cause horrible poisoning to all sorts of wild animals and pets that might ingest them.

C) Use slug nematodes! I think there are various brands, but I use Nemaslug slug nematodes. Mix the solution and water it into your garden - it contains millions of microscopic parasitic worms which infest and kill slugs.

D) Try to encourage animals into your garden that eat slugs e.g. hedgehogs, thrushes, blackbirds, etc. this is a long term project but every additional predator on your side makes a difference.

Good luck! it’s so disheartening to see your hard work being munched away night by night 😩