I do not think it is the end. More like a beginning if you so choose it to be. I think you have learned a lot in this hobby since you got into it a year ago. From your 14 gallon nano through to the current 40gallon breeder tank. There have been many additions and things removed from your tank. Looking back at your started threads, there has been so much going on across your tanks. it is time to step back and use the #1 rule of thumb in this hobby. Nothing comes quickly, slow and steady. Secondly, research everything fully.
I noticed looking back on your threads/signature that you are running a 40 gallon breeder. You also have tried a Lamarck angelfish, suggested to be in a >100 gallon, anthias are >50, and almost any tang would be bad in anything less then a 50. These fish are amazing to look at but would have been extremely stressed even if alone in such a small tank. Even if they were extremely little. To note from there, I believe the QT you set up is only a 20 gallon.
The allure of this hobby is extremely enticing. There are such beautiful corals and fish out there and it is extremely difficult to refrain from impulse buys. All of the tenured hobbyists have had similar mistakes in the past. We all lost fish, did impulse buys and had to deal with the aftermath. I have been in this hobby for about 5 years now and I finally have my current tank rocking.
My advice to you. Take a step back. Take note on your equipment and plan goals. Make a plan on what livestock you want to keep in the tank, what corals, fish, inverts. Then learn about them and what will work together in a system your size. Do not walk away, take it slow and steady with goals in mind.