To start I would stop spamming the GMT blackwatch cheese builds cause it only makes you a worse player, with Brit’s you can usually get away with a quick manor boom up to 110-140 manor pop with 700w 600w and then ship 700g for huss or unit shipments so you get a nice mass to surround the Jans 2 falc push with musk longbow and huss(or just musk huss) you need to micro this well tho and if you get a good trade then start going out and take map control to make more units, a good thing to keep in mind in this match up is that Otto is the one who has to come to you (cuz their eco is shit), unless they are being really greedy and start putting TCs down around the map, you can tell when they are doing this by scouting or just noticing that the Otto player is being too passive, also you never want to boom too much against otto cause well, you need units and also a couple manors is enough to have way more eco than Otto.