Harry, IMHO the things that come ‘from the heart’ are more important than the amount of money spent.
For example, have you some photos that reflect your year together, maybe make an album 'personal 'or find a really good photo of you both and have it framed.
Even if you don’t like cooking ( I don’t) try to have a romantic evening with lots of candles around, a bottle of wine, some music that you both like, some simple nibbles for an apero. Some flowers that you have picked from the garden. Believe me, it’s the things like this that will hold special memories for you both, and that your wife will really appreciate.
A relaxing massage is also something that will go down very well. Don’t try ‘too much’, we women really do like the simple but honest things.
At the end of the day it’s for you both, relax , chill out with some wine, laugh, cry, remember the good days and the bad but above all celebrate being together. Happy 1st Anniversary with many more to come