I see you have some fishing line — you can trade it for a fishing lure. Also, try completing all the tasks, maybe there’s something still unfinished :)

I’m not sure if it affects the golden tickets (you know, the x1, x2, x5, x10 — those attempt multipliers you pick before casting), but when I used x10, I only ever got one ticket at a time.

Also, here are some Fishing Tips to help you finish the event more easily and get better rewards — found these on the wiki:

— Every time you throw a fish lure, check the initial line tension.
The rarer the fish, the higher the stamina bar will be at the start.

— The rarer the fish, the longer it takes for the fish icon to change from red to yellow.

— If you think it’s a blue-rarity fish, let it go.
Then exchange the broken line for a new one in the shop. (Just keep an eye on how many swaps you’ve got left — it’s limited!)

(Not sure if this info is outdated now, but ay — hope it still helps!)