I would say your strategy is actually a lot better then the greedy noobs you mostly find here.
Something similar to what you are doing but a little different, is to save up to get a coin that has masternodes.
Instead of buying every month.
Set aside money each month then jump in to buy up a coin with masternodes (they typically require you to hodl a lot of them).

This is another easy way to get passive income in crypto.

Or, if you don't want to do a masternode yourself, you can invest in a Proof of Stake coin.
The rewards won't be as high, but you don't have to invest as much.

You can always go with ARK, they have a very unique staking model where you vote for people and can change your vote anytime.
There are resoruces that let you see who is giving the biggest payouts.