Although I am not an expert, here are some tips from my side.
Learn to keep your patience first. Because things take time. Believe that!
Being patient does not mean staying idle. You should always run after your dreams. Learn to improve your skills, plan to improve Gig quality, and follow some Gig promotion marketing.
Being online 24 hours is just a myth according to me. But yeah, sometimes buyers choose to contact online sellers if they need any urgent assistance. So, being online is also important as well as replying to the buyers on time. You can use Fiverr's 'Auto Reply' option wisely. Never push yourself too hard to be online for almost 24 hours.
Keep learning always from others and by yourself. Just keep in mind that 'I do not know everything!'
Have a nice time. 🙂