EAT YOUR VEGETABLES FIRST
There will be aspects of language learning that you enjoy more than others. Some people take to reading and writing like fish to water, but are terrified of speaking. Others plunge into conversations, but would never pick up a grammar book if they didn’t have to.
Identify what it is you like the most and least about learning a language. Then at the start of your learning session, when you’re ripe and raring to go, concentrate on those aspects you find most difficult.
Why do these first? It’s human nature that if there’s a task you dread, you avoid it. That can mean you end up avoiding language learning completely, or feeling distracted by the difficult task that’s coming up.
Get the difficult task out of the way by completing it first, and you’ll have extra motivation the parts of language learning that you enjoy more.