Is a FTP increase of 15% possible?

Started cycling one year ago and rode around 6000km last year on Zwift and outside. No structured training, mostly races on Zwift and intense efforts when riding outside during the summer.

Started with an FTP of around 281, 13 months ago. Managed to reach 361 during the summer with 98.6Kg (I'm 6'3 and bodybuilding/weightlifting for over 10 years). Did an FTP test 2 weeks ago and I'm at ~350 while at 105Kg. I would love to hit an FTP of 400.

Since I consider myself a newbie, how realistic is this? I'm 32 and would like to use the following months to work on this, before summer hits. I'm planning to lose weight up to 95Kg.

Which type of training should I look into? Could you give me any guidance on where I can look up structured training etc.? How realistic is this increase? How long would something like this take?

Edit: thank you all for the responses!