TL-DR; Last Hurrah + Well Oiled with Shield + Mythic/Vision Gear is imo the best build you can run on Tick. Playing him like a Poke-Harasser on Bounty and KO is the best you can do with Tick.
Now I may sound like a broken record here, especially with how often Tick gets slandered here for being one of the weakest Throwers out there (at least he's somewhat playable if you play your cards right, unlike cough Dynamike and Grom cough). But almost every Tick player I get, Ladder or Ranked: play him not only with wrong unlockables, but also play him in his worst modes.
And this complain comes out of a guy who not only has been playing the game since 2018, but also enjoys playing Tick, so here's what I have to say about everyone's despised pirate bomber:
Gadget: Most Tick players run him with Mine Mania. And I sorta get the vision: Imma cover the field with more mines and be extra annoying hehe. Sadly this idea doesn't work because well, a player with above room temperature IQ will avoid the extra mines. And if you usually hit 1 mine with your regular attacks, you are hitting 2, MAYBE 3 mines with a Mine Mania'd attack. And that's not worth a Gadget Slot in my eyes.
Last Hurrah on the other hand is more flexible, offering you to not only do something against aggro, but can also be used as a 1-second Damage Reduction against Snipers. And on a decently short cooldown of 15 seconds too. Granted the anti-aggro side of this gadget is showing its age due to more aggro-based brawlers having multiple ways to approach, but it's better than "let me occasionally hit 1-2 extra mines once a full-moon" gadget.
Starpower: Automa-Tick Reload is... a Starpower that I await to see on what Adrian will do with once Tick gets his buffies. Because this SP is... how can I say it without being rude... absolute piece of garbage? It provides a mere 9% faster reload speed on Tick. With how sluggish Tick's reload is, it's about a 0.2 second faster reload. Not only the effect is super meh, but it's also heavily-outclassed by its twin SP.
Also yeah Well Oiled is just much more superior, letting you start passively recover health in just a single second! Now you may be thinking "Tick has like next to none HP anyway, why do I need this?" It makes Tick harder to get chipped down, forcing a more quick brute-force option to handle Tick. Add that with his Last Hurrah Gadget and you can make Tick stay around in battle much more efficiently.
Gears: If I see one more Tick player run him without Shield Gear, I'm going to lose it. With Tick having about 4.8k HP, you NEED Shield Gear, that 900 extra HP is a game changer. As for the 2nd gear, he's very depended on his Mythic Gear right now, but Vision Gear is also a choice considering, well, none of the other Gears really contribute to Tick from my experience.
Gamemodes and Playstyle: Despite his role, he's absolutely terrible at controlling. Which means, yes, avoid all the control-based modes. With how long his range is, you can play him like a long-ranged chipper that can secure kills every now and then. Which fits him better on kill based modes like Bounty and KO.
And if you wanna draft him in Ranked, going him as a last-pick is your only option, as going him even 4th/5th will get you folded by the slightest bit of aggro.
Conclusion: I hope this guide that I wrote way too late in the night helps you understand and play Tick better, as I want there to be better Tick players. If you have any takes to (constructively) disagree with, feel free to write your own takes. :3