fishing is too hard on phone

I play Stardew Valley on phone and ngl everything it's peachy except for fishing. It's just not very intutive.

My fishing XP relies entirely on crab pots and buying from the bookseller... But I need the actual fish for the community center and so far it's been taking me years of checking the traveling merchant every weekend 😭

Do you guys have any tips for fishing on the phone? Please 😭?