You are going to be tempted to spend from your bitcoin or to slow down in accumulating bitcoin merely because you might not have any other investments that had performed as well as bitcoin, and you can also identify a variety of ways that bitcoin your bitcoin stash can bring you a lot more comfort in the present, and sure maybe it would be nice to drive a car rather than a motorcycle and yeah, maybe you would rather have a 2025 or 2026 model rather than a 2019 model, and surely there can be temptations to treat yourself too soon... and I am not sure how guys can get themselves out of such a mindset, except maybe if they can think about ways to gamify their bitcoin buys and even if they focus on figuring out how to make more money so that they can buy more bitcoin, so sometimes they can figure out ways to place some emphasis on every month making sure that they had more bitcoin (satoshis) than they had the month before, and yeah, maybe it is better to be able to stack 100k satoshis in a month versus a couple thousand in order to make it meaningful.
I used to create a game out of my weekly buys. I usually tended to create a budget for 6 months, and then divide that budget into 26 parts (1 part for each week), so each week I had a budget to buy bitcoin, and so sometimes I would try to have fun with that weekly buy amount and try to time the dip within the week, but at the same time, I made sure that I bought the whole amount by the end of the week, even if the price did not dip. Another thing that I would do is to sometimes go beyond my weekly amount, so I would try to figure out if I could get more income for the week to add to my weekly allowance, and it was not always easy, so if I ended up having an additional $100 come in, then i would divide that into 2 parts. $50 would go into bitcoin and the other $50 would go into my cash reserves (anticipating that the amount might be needed for expenses), since sometimes even having an extra $100 come in, I would just assume that there might have had been some costs that were involved in getting that extra $100 come in... and at some point after my next paycheck came in and my various balances were looked at, then sometimes I could also add whatever extra funds into my bitcoin buys.. so even though i had a weekly bitcoin buying budget, I would also have some other funds that might come available from time to time, and I tried to make a bit of a game out of the whole process of both building up my BTC and also making sure that I was not spending them - except spend and replace (including gifts to others (like $5 or $10) that would be treated like a spend and replace). It kept me in the process of constantly reminding myself to buy bitcoin.
This is actually a really solid strategy of keeping yourself disciplined. I recently read Atomic Habits by James clear and one thing he said in the book is " to create a new habit you must make it attractive " That's what you did by gamifying your investments and that's what I think helped you In creating the Habit of Investing in Bitcoin and Making DCA more easier For you.
I believe that without making DCA your habit you can't do it successfully because you will be tempted to sell it to feed a craving. But what IF you make investing Your Craving then you will have no problem in investing your money without getting tempted to sell it for something else. Also your 50/50 split between Bitcoin and cash reserves is a smart approach because people either go all-in or not invest at all.
What you are describing in a way is that building a lifestyle around bitcoin accumulation is important. That way you are not just investing but resisting short term temptations but still don't get exhausted or burnt out. That may be a reason you are consistent and others fall off.