I'd advise against generalizing any transactions. While I agree that a conservative, DCA approach is usually optimal, especially for newbies and those with low finances, other investment techniques might be advantageous.
I'd also like to point out that your "shitcoin" stance is really binary. Altcoins with good fundamentals and large returns exist. Diversification can reduce risk even in crypto. Each investor should do their homework before investing.
Looking at the conditions for those of us who may be categorised as small investors, DCA is actually the most possible thing even though when saying conservative it seems like the only way but indeed DCA is indeed one of the good things apart from waiting for momentum and buying on the dip.
I will not say that for shitcoin and verified is a mistake but when referring to the existing context of "small investors" especially for OP who BDT 10000 for a year as OP said what needs to be verified because this will make the shrinkage bigger especially when talking about shitcoin.
Although the rate of return on bitcoin is lower especially if we save a little but when talking about certainty of course it is more worth it.