Reaching level 8-9 in a month is quite realistic if you play at least 3 hours a day. However, you must focus not only on your ELO, but also on your skill. Focus on improving your marksmanship and reflexes, and you can go well above level 8-9.
A good way to do this is to play with Faceit bots. Faceit bots are AIs that help you improve your skills by letting them shoot at you and letting them kill you. The more time you spend with them, the better your aim will be.
But the best option would be to ask for help from a boosting service like https://boostingworld.gg/faceit-boosting. I think this is definitely something that will help you boost Faciet.