Of course, there is no guaranteed price performance with bitcoin, but historically, one of the best ways to invest in bitcoin has been dollar cost averaging and continuing that process, and the longer than any BTC HODLer/accumulator is engaged in bitcoin investing the more likely that s/he is in profits and the amount of the profits is likely to be greater, greater and greater with the passage of time... again .. no guarantees.

Take your example of starting out investing in BTC in the beginning of 2019 and continuing until this date.  If you had invested $200 per month (or $50 per week) for that whole time, you would have had around $6,650 invested until this date, and your BTC accumulation amount would have been around 0.715BTC, and so that would have been worth nearly $24k - so almost 2.6x in profits.  Not bad.. not bad.. especially for a $50/week or $200/month ongoing investment... and perhaps it could be an amount that you are not too attached to in terms of if you ended up losing it all, so it would be preferable that you do not get emotional if the BTC price UP, DOWN or sideways... and perhaps 10 years later, you can start contemplating whether you have enough BTC or whether you might need to change your BTC accumulation strategy.

One thing about being in the midst of the largest wealth transfer in history, it would be nice to have some of that valuable asset.. and to accumulate such asset (whether you believe that there is actually a wealth transfer or not going on), and in the process of accumulating the asset (referring to bitcoin here), you do not necessarily need to invest a lot to have the potential of profiting considerably... that's kind of the nature of an asymmetric bet, to be able to invest a little, but still be able to have the potential of profiting a lot, even if such high profit scenario does not end up playing out as high as you wished it would have and also a possibility that what had seemed to have been an asymmetric bet ends up failing (or falling on its face, completely).