you should learn C# html, javascript(JS) and C(+)(+)then sign up for replit, you can download your games and it will run faster than the leopard import/export for scratch to Itch, it will take practice but it is fun, also, I recommend making custom sprites on these two platforms:
have fun coding!
(tip, try using the abs val, cos, sin, ETC block when using scratch, they are VERY helpful for decoding, encoding, and a lot more)
-----------------------------------------------------------------------------------------
LAST THING: remember that leopard removes some of your code depending on the block so try to substitute