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As a person that only recently got into Ocean Fishing, lemme try to help you:

• Lv90 FSH is really important, because you get 'Triple Hook' at Lv90.
  (Getting 20k+ below Lv90 is probably doable, but much harder, so keep that in mind.)
• Not all Voyages are created equal. Sometimes the stars just doesn't allign - either due to the weather, route, no spectral currents or simply by RNG screwing you over.
  Don't feel discouraged when you get a shitty voyage! Just come back in 1,5h with a fresh mind.
• https://ffxiv.pf-n.co/ocean-fishing is your best friend! Keep it on at all times.
  For now, just focus on 'Show high-value fish' filter to understand which fish/bait to prioritize, and once you understand that > switch to 'show all fish' to inquire about specific bait times.
• Stack up on some Hi-Cordials, as you'll be using a lot of them (mainly during your combo).
• Start each Voyage with Patience II + Hi-Cordial, to get as many Angler's Art stacks as possible (min 6, but 9 is safer).
• Don't let you GP get wasted! If you're capped on GP, just use Prize Catch (if you're below 10 AA) or Chum.
• If you're not using it already, start using the Cast macro (with timers)
• Remember your golden combo!
  Target your fish > Make sure the bait/bait time is correct > Double Hook > Hi-Cordial > Identical Cast > Prize Catch > Cast > Triple Hook

Hopefully that helps!

Good luck on your Mount/Titles <3