We all have had our roller coaster ride of ups and downs from day to day.. There's a time to coast along, and there's a time to peddle. There's a time to flow gently with the stream, and there's a time to paddle. It's great when the ship moves along by catching the wind in the sails, but when there is no wind, it's good to have oars too.
There's a time to ride the wind as an eagle, and there's a time to flap your wings. There's a time to descend, fold your wings, walk and feed on some food to replenish strength to lift up into the heights again.
We all know what it's like when the coasting along slows down even though we still want it to continue. I keep that uplifted joy with me always by frequent thanksgiving unto God.
I maintain the fervor by beginning my day with joy in Him. Saying, This is the day that the Lord has made, I do rejoice and I am glad in Him. I say it even when I don't feel it. I begin reading scripture even when I don't feel any interest to. I read it outloud to myself because that is what Josh.1:8 meditation is.
At such times when I don't feel elated about reading God's word, that's when I double up on speaking scriptures of joy in God. And speaking scriptures of praise unto God.
(applying the following scriptures personally to me)
Jer.15:16 Your words were found, and I ate them (Lk.6:45; Josh.1:8),. And Your word was to me the joy and rejoicing of my heart; For I am called by Your name, O LORD God of hosts.
Ps.19:10 Your words are more precious to me than gold, yes more valued than much pure gold; they are (to me) sweeter than honey from the honeycomb.
Pv.22: 17-19 I incline my ears and hear the words of the wise (spoken from my own mouth) and apply my mind to the knowledge of God, (speaking and thinking is Josh.1:8 meditation)., for it is pleasant when I keep Your knowledge and Your wisdom within me that they are constantly on my lips. So that my trust may be in the LORD.
And I also confess the promise of -
Isa.40:31 Those who eagerly look forward to
renewed passion for God will be renewed; They will lift up their wings [and rise up close to God] like eagles [rising toward the sun]; They will run and not become weary, They will walk and not grow tired.
I'm

for you to be renewed in your zealousness for God and His word because we all need refreshing from time to time, and to replenish the oil in our lamp that our wick is on fire for God.