Back in 2019, I honestly just wanted to challenge myself and contribute to the network I was benefiting from. All the PRs and reviews ever since have been the result of realizing we need to ensure the codebase is in good shape, always.
I am optimistic that as more structure and decoupling are introduced in projects like core, it'll become much more manageable to review code, make protocol changes, and build atop Bitcoin. I am also optimistic that necessary changes to the underlying protocol would be made to give more power to layers higher up the stack, such as LN, to improve how the network operates at a protocol level.
Another good thing is with more grant programs, especially ones with mentors, it'll be a lot easier for devs to get onboarded into the space and freely contribute without worrying about their financial circumstances or having to divide their focus working multiple jobs.
This also extends into the Bitcoin startup ecosystem, I am glad to see, outside of Recursive, Ten31, Ego Death Cap, and others, an increasing number of Bitcoin VCs are coming up, which helps with strengthening the signal in the space as more sound projects get funded. It'll also encourage others to build viable companies and not have to worry about pleasing Web3/crypto funds by integrating additional projects outside Bitcoin/LN.
Beyond that, I'd say my biggest concern is if we get to a stage where soft forks are considered a no-no, that will introduce a level of complexity that would further complicate and potentially negatively affect overall development.