Let your domain age more in years. The domain age helps in Increasing domain authority . This shows you have been present since long and consistently. If you have practiced all above, now keep patience.

The more it ages, trust factor will improve with it.

Follow a mantra "Concentrate on content quality and link building ".

Don't give up, if it fluctuates.

You now have factors to look upon. Work on them correctly. Your domain authority will increase. Little efforts are worthy when results are fruitful and relishing.