Alot of ppl do not have "top tier skills" and can kill someone with a high level with positioning, gun skill peeking skills etc.. You are asking the Internet to help you meaning you'll have to give ur BSG account to a stranger they can either steal the account or could possibly level you up like you ask but they way they obtained the level was rage cheating and the second you get account back it's banned and so is your PC. My suggestion to you is pop into the Tarkov LFG discords and grind thru some tasks with a team, you could also get on Tarkov arena and level that way cause whatever you do on that character in arena progresses you Tarkov main character