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I am also a person who has a monthly salary and works in the government, For investment I focus more first on my family's monthly expenses and for investment I allocate buy BTC with DCA according to propriety, sometimes this month it can get 0.00047 BTC and sometimes next month it can be up to 0.00067 BTC.
If you invest using DCA it will de-risk you a lot,
but you should always analyze the market, and it will be good for you. Also, you should know before investing that you only invest the amount of money you can afford to lose.
I totally disagree with this statement here that I made bold, as an investor, I think it's pointless analysing the market because as an investor that is only thinking long, it actually not necessary doing that, analysing the market are meant for traders, not an investor that is only thinking long term.
But I fully agree with this other statement that we should only invest money we can afford to lose, to me, that is what a good investor in Bitcoin should be doing, by investing an amount of money he can do away without for a very long period of time.