I don't find empty platitudes like "you can just do things" all that inspiring. I prefer seeing a specific example of something you could do and an explanation about why it might help.
You could look at your situation, think about it as objectively as you can (ignoring, as much as possible, any media driven mind worms), pick any particular problem you face that looks solvable, and try to solve it. If none of the problems seems particularly solvable, break them into pieces and look at the resulting sub-problems in the same way. Regardless of the outcome, iterate, since it's ultimately a numbers game.
The reason this might help is that 1) you might solve some fraction of your problems, 2) to the extent that you're suffering from learned hopelessness, you'll be unlearning it, 3) regardless of either of the above, you'll be likely to learn something, as this is a very common side effect of trying to do stuff.
You can literally just sit down, right now, and do this.
But if you insist on hearing about a specific example of something I did, here's one that's appropriate. I was frustrated that all the time I spent reading/hearing/watching about other people solving their problems left me oddly dissatisfied. I realized that that was because it wasn't actually solving any of mine (except perhaps assuaging boredom a little). Thinking about it, I realized that that was because I was wasting the impetus to improve my situation on voyeurism.
You can install solar panels on your house, and a heat pump. This will help reduce fossil fuel energy usage.
You can self-host Mastodon and help move your friends and family members still using Xitter onto it. This will help reduce the support being given to fascist oligarchs.
You can find a local soup kitchen, or animal shelter, or library, and volunteer some of your time there. This will help provide for people and animals without other support.
Trying to do something bigger than that is going to require more people, and may require resources you don't have; I don't know your situation. You haven't really given anyone much to work with in giving you examples, and the post you're replying to a) isn't really giving "empty platitudes", and b) is talking very broadly about problems in the abstract, so there's not much guidance there as to what kind of "something you could do" you're looking for.
You could look at your situation, think about it as objectively as you can (ignoring, as much as possible, any media driven mind worms), pick any particular problem you face that looks solvable, and try to solve it. If none of the problems seems particularly solvable, break them into pieces and look at the resulting sub-problems in the same way. Regardless of the outcome, iterate, since it's ultimately a numbers game.
The reason this might help is that 1) you might solve some fraction of your problems, 2) to the extent that you're suffering from learned hopelessness, you'll be unlearning it, 3) regardless of either of the above, you'll be likely to learn something, as this is a very common side effect of trying to do stuff.
Hope that helps.