1. d4 e6 2. c4 Nf6 3. Nc3 d6 4. Nf3 Nfd7 5. e4 Be7 6. Be2 O-O 7. O-O Re8 8. Be3 Nf8

I tried a few games against https://lichess.org/@/maia9, which is a neural network trained on 1900 rated lichess games, so it is supposed to play like an 1900 rated human

an 1900 would be easy target for me, but my results against this maia bot are very poor

while the bot indeed plays 1900 strength moves, the psychological factor is missing, its thinking times do not reflect human thinking times, so all my psychological warfare does not work on this bot, I lost 20 rating point playing against maia

Like 20 online blitz rating points have any significant meaning.

Bro, if you play a st opening and claiming that it is a good opening, then at least beat st bot.

https://github.com/CSSLab/maia-chess/issues/2

https://i.imgur.com/R8g7mbT.png

We are not talking about, what you play as white, bc you can play whatever you want, but your settup with black is just bad.
The reason is simple: You are with black underdeveloped! Also white can play whatever he wants, his plan is simple:
White has a space advantage. He will just normally develop and then go a4-a5 and expand on the queenside. If you play ( which you will, beacuse otherwise I dont see any other plan) e5, white will play d5 and then c5. The problem is, back isnt enough prepared for f5, so his position will be very hard to play. In blitz, the space advantage is even stronger, so more or less it is one-sided game.

This is how I would react with white. But i woudnt play 11.d5? but rather 11. a5!
Your main ideas are to play a5 and stop whites invasion on the queenside. After 11.d5? you have 11....exd5! 12. exd5 and c5! where black gets a good game. Instead you played 11....e5? and again 12.a5 was strong!

Here are some ideas for black to help you, but i still think if white plays correctly, blacks position will be bad.

11. d5 is a typical desparate move, because seeing hedgehog position white becomes frustrated to get some break, this is what I'm looking for

of course the catch is to expand on the queen side, but not every white player realizes this, and those who do, may be slow to figure how to make it work

this strategy requires that I can play against a wide opponent base, so that white does not get accustomed to my strategy, but lichess offers this wide selection of opponents, so I don't worry about this

Yes It is a reasonable strategy. But it can backfire and kill you (chesslike)! I already suggested what to do, if he plays d5 and if he is expanding on the queenside to akward ( if your oponent play d5, before you play e5, simply take on d5 and c5!, there are also ideas with a5, if white plays a4). So if white dosent react to well, you can equalize.