I have been Dollar Cost Averaging into $SPS since September of 2021... So that was like $.50 up to $.90+ and then... All the way down.
I earn a decent amount of SPS from playing Soulkeep, Brawls, Wild Battles, Licenses and more... but I also buy some occasionally too.
I posted a similar article about this not too long ago and I think that buying small, affordable amounts regularly is the best way to accumulate something over time that won't stress you out :)
Best of luck with your 200k and I hope you reach it soon!