Please help me render best possible settings in PHOTOSHOP for my youtube banner

[UnderDogNowOnTop]

I did all different formats. It looks nice on my computer not on Youtube, tried different browser.. Same

I stayed up 2 days, took adderrals feel sick like i just got used for sex. I uploaded a different one thinking I did something wrong once again, blurry.

[UnderDogNowOnTop]

https://www.youtube.com/channel/UCgzzjS49_EQMmaxgHz48mUQ?view_as=subscriber