Creating a reserve fund for yourself is not some discovery. Even before the creation of Bitcoin, many adhered to putting aside ten percent of their earnings; this is how the "American dream" of becoming a millionaire was voiced. In our time, Bitcoin appeared, which created a lot of motivation for investing in it, adding to its profitability over time. Only lazy or stupid people will not take advantage of this opportunity, being young, to invest part of their earnings. We must always consider that everything we sow today, tomorrow will show us by the fruits. If we do not care very much and spend everything we earn, then very soon, the demand may disappear, and a need will appear. OP, you are young and do not hesitate to be better, think about the future, but do not forget about your health.
If you don't learn to dream, it will remain invisible forever and you will be drowned in regret. I am saying that those who have joined the rich list in modern times were not in such financial condition even 10-15 years ago. They have reached their goals through their own efforts and practice. I have said that to force yourself to save bitcoins and after it meets the overall needs of the family and concretely so that going forward with this strategy and you have a cycle of 4 years/or more and reduce excess expenses or withdraw from excess entertainment. I am trying to motivate you to save bitcoins without spending extra money so that you can immerse yourself in better financial benefits in the end. Lazy and foolish people rely on luck and refrain from encouraging themselves to earn more and choose a life of luxury which is the way to regret the end of their life. DCA strategy would be like planting a seed that will grow into a tree with care over time and in the midst of storms and other natural calamities trying to reap fruit through care after long period.
What do you mean by flexible investment? I think that it's best to invest some part of the money in Bitcoin and lock your funds. Then, invest some part of your money in Bitcoin, which you'll sell if you have an emergency case. It's very tough for an average person to invest their money in Bitcoin and not touch it during emergencies because sometimes there are moments when you really need it. So, if you invest some part in locked investment and some part in flexible investment, I think that in the long term, you'll be better this way.
Over the years, I built a good discipline to not rush or become a victim of FOMO but despite that, I have one wallet for long-term Bitcoin investment and I use a Bitcoin TimeLock feature, which means that for a specific amount of time, I won't be able to sell my coins, doesn't matter how much I wish but I also have another wallet which I can always use to sell my coins in emergency cases. I do this because I invest a significant portion of my income in Bitcoin, i.e. I risk more than I can afford but gladly I didn't have an emergency case and I haven't touched this wallet yet.
By flexible investing, I mean unimportant investing where investors have the idea of an average investment and can make whatever they want. He doesn't feel pressured when investing. You should feel pressured to accumulate Bitcoin from disposable income. The possibility of creating space for neglect in traditional investment strategies and from there getting serious about accumulate for future financial independence. It may not be easy for you to lock up funds if you are flexible when it comes to Bitcoin. So keep yourself rigid for future highs and depositing Bitcoin regularly and continuously for long period.