Don't hate on yourself for not wanting to move up. Your job is valuable, or people wouldn't give you money to do it. If you're asking me, there's a certain respect you have to give people who prioritize their happiness over money or status. It's the opposite of greed, which I find commendable. What's the point of money if you're not happy enough to enjoy it?
You may one day find yourself in a company or position where you do want to move up. But for now there's no shame in being content.
It's much easier than thinking.
Don't get involved with people who enthusiastically shit on others' ideas, while having none of their own. Can't count how many times I've countered a complaint with "Ok, what would you do?" only to be met with those empty eyes that tell you there's nothing happening behind them.
Some people just think conversation is defined as bitching.