Has it ever crossed your mind that there is much less activity in both Dogecoin and Litecoin? Have you considered the fact that these are pretty much prone to the same problem?
That's exactly the thought I have for Monero.
I mean, the only chain I like apart from Bitcoin is Monero. I own some XMR too. I know that monero has a dynamic block size, depending on the congestion, which I also think is not the best idea.
But if you look into Monero's average block size against Bitcoin's average block size, you will see Monero's is lower. Why? Bexause the traffic / activity in Monero is much smaller than the traffic in Bitcoin's blockchain.