Need recipe help

Recently joined the aereopress Brewers cup and just made my first cup and it tasted so weak. I used a 100 ml 18 gram steep for 30 sec and at 45 sec press. Dilute to 150 gram. I grind on a Timemore 078. I used sibarist fast filter and a aereopress booster. Mayby I should steep longer or grind finer. Its a Colombian semi washed coffee we are using. I want to make a cup that I like myself as imo if you like it yourself thats the most important.