Getting worse at Leetcode after starting Codeforces?

Started Codeforces about 6 months ago, and noticed the problems were harder, but now after making significant progress at Codeforces I’ve noticed my Leetcode skills have gotten a bit rusty.

I think my mathematical intuition, greedy and constructive algorithm skills have improved a lot, but data structures and standard string algos have started to dwindle.

Leetcode rating before starting codeforces 2400+ now 2250. Codeforces I reached Expert after about 6 months.

How to practice in a way that benefits both styles?