You are not tanking, you are putting the basis for a solid team. Expand your arena, learn to train your players, invest for the next draft and finish last in your league to take the best prospects. Repeat the process if you don't have enough with one season. When your arena is ready and your trainees start to look good, buy some players to complete your team. Then you can start to compete.
In the meantime, learn about GS, enthusiasm, tactics, training, etc.
This is the fastest way to improve your team. A bit slow at the beginning, but worth it later.
There is always other options. For example, you could buy a bunch of old guys on the cheap and try to compete that way. Or you could spend your money in the transfer list. Or try to make money trading players. I don't recomend any of these ways for several reasons.
I don't like to advice newcomers not to compete when they start in this game, so feel free to do whatever makes you have more fun. But if I had done what I tell you in my first 5 seasons, I would have climbed to the top a lot faster.