And you are currently going between tiers 19 and 20? If that's so, I think that there's no rush to do any immediate changes. You have already invested in Tiki quite a lot, so if you like her, it would be good to finish merging her after you get those last few copies.
As for the rest, I honestly think that you should find heroes, that you actually like, although I noted that you don't have any absolute favorites. The reason for this is that if you don't like the hero that you are going to be merging up, you will lose all the excitement and drive from getting a next merge copy or getting enough feathers for another merge. The whole journey will then feel like a boring chore.
The arena really isn't anything special and if you are indeed between tiers 19 and 20, there is no need to rush any big changes, because the rewards that you are already getting are good enough for normal progress through the game.
EDIT: I can give my own experience as an example. When dragons got their refinement options and Nowi became one of the most powerful heroes, I felt like I had to merge her up despite hating absolutely everything about her. Her art is awful, and her personality and voice acting are annoying. In the end I was kind of bummed down that I had to dump more and more feathers to finish her and the whole time that I was completing my merge goal, was probably the most boring time I had in FEH, because it felt just like a routine and not something that I would be looking forward to.
After that I basically said "fuck arena" and I just merged whoever I actually liked.
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