$50 Monthly SEO for Caterer

My hog roast and BBQ catering company works events UK Lancashire area and I want to make sure customers find me first when they search for wedding, festival or corporate catering in my area in the UK. I can set aside roughly $50 each month and already have a starter list of keywords drawn from past enquiries and competitor analysis. what can you offer? how many keywords? how many links? why i should choose you NO AI responese pls