1. Excessive Government borrowing
2. Unwanted and unstable domestic policy
3. Unsatisfiable or lack of domestic production
You left out a very important one: high energy prices, which affect everything. If gasoline and electricity prices go up, you not only pay more to fill up the tank and for the electricity in your house, you will also pay more for groceries, for example.
In fact, the inflation we have been experiencing for a couple of years now is mainly due to energy prices and massive post-covid printing. Then it was exacerbated by the Ukrainian war, but it started earlier.
And the fact these things are big issues does mean that an action of an individual would change the whole economy of the country. It won't. But one's action can change their entire life. The only way to beat inflation is through investing in any means. It could be real state, currency, stocks, or highly volatile BTC.
If you accumulate assets that have appreciating value then you can catch up with the inflation rate going higher. Because you know, if you only hold a dollar, overtime it is losing its value.