Baby sleeps only after 11 pm

Hi mummies, ive been trying to sleep train my 2.5 month baby since a long time ago but its not working that well. Usually 7pm, i will start to bring him into the room to let him sleep. Ive made the room to be dimly lit etc for him to differentiate between day and night. but once i swaddle and put him into the cot, he cries badly. we tried so many methods even put him next to us but he refuses to sleep. he will cry until 10 plus of which then he will fall asleep after we pacify him… any mummies who managed to overcome this?