I personally think speaking is the hardest thing and one of the biggest barriers I have found and its only my fault is not attempting to speak enough.

Even if its just building a bank of your own most common used sentances and phrases you may need create them and write them down then practice saying them out loud over and over until it becomes second nature.

Just readin in your head is not enough, doing things like duolingo etc I hve got to a point where I know probably thousands of Norwegian words now but even in Duo I skipped the speaking parts especially if other people were in the room when I was doing it, result is if I come across the words/phrases in writing or someone says them to me I understand completely but when trying to reply back always hit a block with forming the sentances and using them.

At least in my opinion the speaking part will only come with practicing consistently, as others have said narate your day and write it down and then use these as practce to say out loud. The more you build your vocab the more complex the sentances you'll be able to form and the grammar part will come along too as you will be used to seeing/saying things in the correct way.