One way to get consistent with doing Leetcode is - Leetcode has this problem of the day. When you submit a correct solution, it gives you 10 coins but also shows you how many days streak you have.
I did this continuously for 15-16 days , then when it reset to 0 I got frustrated . This made me open Leetcode every single day. So , right now I'm at 630+ days.
When you cross maybe 100 or 200 it kind of becomes a part of your life. Now , even when I don't want to do Leetcode i do it so that I don't lose the streak.